EASY MULTIPLICATION:
By using formula (a+b)(a-b)=a2-b2 we can do easy multiplication.
In this case we are using base numbers as 100,400,900,1600,2500,3600,4900,6400,8100,10000.
We need to practice the the square numbers from 12 to atleast 502.
Base number:10
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number (100).In fourth column we are subtracting squared numbers from a base number.
9x11
|
(10-1)(10+1)
|
(102-12)
|
(100-1)
|
99
|
8x12
|
(10-2)(10+2)
|
(102-22)
|
(100-4)
|
96
|
7x13
|
(10-3)(10+3)
|
(102-32)
|
(100-9)
|
91
|
6x14
|
(10-4)(10+4)
|
(102-42)
|
(100-16)
|
84
|
5x15
|
(10-5)(10+5)
|
(102-52)
|
(100-25)
|
75
|
4x16
|
(10-6)(10+6)
|
(102-62)
|
(100-36)
|
64
|
3x17
|
(10-7)(10+7)
|
(102-72)
|
(100-49)
|
51
|
2x18
|
(10-8)(10+8)
|
(102-82)
|
(100-64)
|
36
|
1x19
|
(10-9)(10+9)
|
(102-92)
|
(100-81)
|
19
|
Base number:20
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(400).In fourth column we are subtracting squared numbers from a square of base number.
19x21
|
(20-1)(20+1)
|
(202-12)
|
(400-1)
|
399
|
18x22
|
(20-2)(20+2)
|
(202-22)
|
(400-4)
|
396
|
17x23
|
(20-3)(20+3)
|
(202-32)
|
(400-9)
|
391
|
16x24
|
(20-4)(20+4)
|
(202-42)
|
(400-16)
|
384
|
15x25
|
(20-5)(20+5)
|
(202-52)
|
(400-25)
|
375
|
14x26
|
(20-6)(20+6)
|
(202-62)
|
(400-36)
|
364
|
13x27
|
(20-7)(20+7)
|
(202-72)
|
(400-49)
|
351
|
12x28
|
(20-8)(20+8)
|
(202-82)
|
(400-64)
|
336
|
11x29
|
(20-9)(20+9)
|
(202-92)
|
(400-81)
|
319
|
10x30
|
(20-10)(20+10)
|
(202-102)
|
(400-100)
|
300
|
9x31
|
(20-11)(20+11)
|
(202-112)
|
(400-121)
|
279
|
8x32
|
(20-12)(20+12)
|
(202-122)
|
(400-144)
|
256
|
7x33
|
(20-13)(20+13)
|
(202-132)
|
(400-169)
|
231
|
6x34
|
(20-14)(20+14)
|
(202-142)
|
(400-196)
|
204
|
5x35
|
(20-15)(20+15)
|
(202-152)
|
(400-225)
|
175
|
4x36
|
(20-16)(20+16)
|
(202-162)
|
(400-256)
|
144
|
3x37
|
(20-17)(20+17)
|
(202-172)
|
(400-289)
|
111
|
2x38
|
(20-18)(20+18)
|
(202-182)
|
(400-324)
|
76
|
1x39
|
(20-19)(20+19)
|
(202-192)
|
(400-361)
|
39
|
Base number:30
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(900).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
29x31
|
(30-1)(30+1)
|
(302-12)
|
(900-1)
|
899
|
28x32
|
(30-2)(30+2)
|
(302-22)
|
(900-4)
|
896
|
27x33
|
(30-3)(30+3)
|
(302-32)
|
(900-9)
|
891
|
26x34
|
(30-4)(30+4)
|
(302-42)
|
(900-16)
|
884
|
25x35
|
(30-5)(30+5)
|
(302-52)
|
(900-25)
|
875
|
24x36
|
(30-6)(30+6)
|
(302-62)
|
(900-36)
|
864
|
23x37
|
(30-7)(30+7)
|
(302-72)
|
(900-49)
|
851
|
22x38
|
(30-8)(30+8)
|
(302-82)
|
(900-64)
|
836
|
21x39
|
(30-9)(30+9)
|
(302-92)
|
(900-81)
|
819
|
20x40
|
(30-10)(30+10)
|
(302-102)
|
(900-100)
|
800
|
19x41
|
(30-11)(30+11)
|
(302-112)
|
(900-121)
|
779
|
18x42
|
(30-12)(30+12)
|
(302-122)
|
(900-144)
|
756
|
17x43
|
(30-13)(30+13)
|
(302-132)
|
(900-169)
|
731
|
16x44
|
(30-14)(30+14)
|
(302-142)
|
(900-196)
|
704
|
15x45
|
(30-15)(30+15)
|
(302-152)
|
(900-225)
|
675
|
14x46
|
(30-16)(30+16)
|
(302-162)
|
(900-256)
|
644
|
13x47
|
(30-17)(30+17)
|
(302-172)
|
(900-289)
|
611
|
12x48
|
(30-18)(30+18)
|
(302-182)
|
(900-324)
|
576
|
11x49
|
(30-19)(30+19)
|
(302-192)
|
(900-361)
|
539
|
10x50
|
(30-20)(30+20)
|
(302-202)
|
(900-400)
|
500
|
9x51
|
(30-21)(30+21)
|
(302-212)
|
(900-441)
|
459
|
8x52
|
(30-22)(30+22)
|
(302-222)
|
(900-484)
|
416
|
7x53
|
(30-23)(30+23)
|
(302-232)
|
(900-529)
|
371
|
6x54
|
(30-24)(30+24)
|
(302-242)
|
(900-576)
|
324
|
5x55
|
(30-25)(30+25)
|
(302-252)
|
(900-625)
|
275
|
4x56
|
(30-26)(30+26)
|
(302-262)
|
(900-676)
|
224
|
3x57
|
(30-27)(30+27)
|
(302-272)
|
(900-729)
|
171
|
2x58
|
(30-28)(30+28)
|
(302-282)
|
(900-784)
|
116
|
1x59
|
(30-29)(30+29)
|
(302-292)
|
(900-841)
|
59
|
Base number:40
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(1600).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
39x41
|
(40-1)(40+1)
|
(402-12)
|
(1600-1)
|
1599
|
38x42
|
(40-2)(40+2)
|
(402-22)
|
(1600-4)
|
1596
|
37x43
|
(40-3)(40+3)
|
(402-32)
|
(1600-9)
|
1591
|
36x44
|
(40-4)(40+4)
|
(402-42)
|
(1600-16)
|
1584
|
35x45
|
(40-5)(40+5)
|
(402-52)
|
(1600-25)
|
1575
|
34x46
|
(40-6)(40+6)
|
(402-62)
|
(1600-36)
|
1564
|
33x47
|
(40-7)(40+7)
|
(402-72)
|
(1600-49)
|
1551
|
32x48
|
(40-8)(40+8)
|
(402-82)
|
(1600-64)
|
1536
|
31x49
|
(40-9)(40+9)
|
(402-92)
|
(1600-81)
|
1519
|
30x50
|
(40-10)(40+10)
|
(402-102)
|
(1600-100)
|
1500
|
29x51
|
(40-11)(40+11)
|
(402-112)
|
(1600-121)
|
1479
|
28x52
|
(40-12)(40+12)
|
(402-122)
|
(1600-144)
|
1456
|
27x53
|
(40-13)(40+13)
|
(402-132)
|
(1600-169)
|
1431
|
26x54
|
(40-14)(40+14)
|
(402-142)
|
(1600-196)
|
1404
|
25x55
|
(40-15)(40+15)
|
(402-152)
|
(1600-225)
|
1375
|
24x56
|
(40-16)(40+16)
|
(402-162)
|
(1600-256)
|
1344
|
23x57
|
(40-17)(40+17)
|
(402-172)
|
(1600-289)
|
1311
|
22x58
|
(40-18)(40+18)
|
(402-182)
|
(1600-324)
|
1276
|
21x59
|
(40-19)(40+19)
|
(402-192)
|
(1600-361)
|
1239
|
20x60
|
(40-20)(40+20)
|
(402-202)
|
(1600-400)
|
1200
|
19x61
|
(40-21)(40+21)
|
(402-212)
|
(1600-441)
|
1159
|
18x62
|
(40-22)(40+22)
|
(402-222)
|
(1600-484)
|
1116
|
17x63
|
(40-23)(40+23)
|
(402-232)
|
(1600-529)
|
1071
|
16x64
|
(40-24)(40+24)
|
(402-242)
|
(1600-576)
|
1024
|
15x65
|
(40-25)(40+25)
|
(402-252)
|
(1600-625)
|
975
|
14x66
|
(40-26)(40+26)
|
(402-262)
|
(1600-676)
|
924
|
13x67
|
(40-27)(40+27)
|
(402-272)
|
(1600-729)
|
871
|
12x68
|
(40-28)(40+28)
|
(402-282)
|
(1600-784)
|
816
|
11x69
|
(40-29)(40+29)
|
(402-292)
|
(1600-841)
|
759
|
10x70
|
(40-30)(40+30)
|
(402-302)
|
(1600-900)
|
700
|
9x71
|
(40-31)(40+31)
|
(402-312)
|
(1600-961)
|
639
|
8x72
|
(40-32)(40+32)
|
(402-322)
|
(1600-1024)
|
576
|
7x73
|
(40-33)(40+33)
|
(402-332)
|
(1600-1089)
|
511
|
6x74
|
(40-34)(40+34)
|
(402-342)
|
(1600-1156)
|
444
|
5x75
|
(40-35)(40+35)
|
(402-352)
|
(1600-1225)
|
375
|
4x76
|
(40-36)(40+36)
|
(402-362)
|
(1600-1296)
|
304
|
3x77
|
(40-37)(40+37)
|
(402-372)
|
(1600-1369)
|
231
|
2x78
|
(40-38)(40+38)
|
(402-382)
|
(1600-1444)
|
156
|
1x79
|
(40-39)(40+39)
|
(402-392)
|
(1600-1521)
|
79
|
Base number:50
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(2500).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
49x51
|
(50-1)(50+1)
|
(502-12)
|
(2500-1)
|
2499
|
48x52
|
(50-2)(50+2)
|
(502-22)
|
(2500-4)
|
2496
|
47x53
|
(50-3)(50+3)
|
(502-32)
|
(2500-9)
|
2491
|
46x54
|
(50-4)(50+4)
|
(502-42)
|
(2500-16)
|
2484
|
45x55
|
(50-5)(50+5)
|
(502-52)
|
(2500-25)
|
2475
|
44x56
|
(50-6)(50+6)
|
(502-62)
|
(2500-36)
|
2464
|
43x57
|
(50-7)(50+7)
|
(502-72)
|
(2500-49)
|
2451
|
42x58
|
(50-8)(50+8)
|
(502-82)
|
(2500-64)
|
2436
|
41x59
|
(50-9)(50+9)
|
(502-92)
|
(2500-81)
|
2419
|
40x60
|
(50-10)(50+10)
|
(502-102)
|
(2500-100)
|
2400
|
39x61
|
(50-11)(50+11)
|
(502-112)
|
(2500-121)
|
2379
|
38x62
|
(50-12)(50+12)
|
(502-122)
|
(2500-144)
|
2356
|
37x63
|
(50-13)(50+13)
|
(502-132)
|
(2500-169)
|
2331
|
36x64
|
(50-14)(50+14)
|
(502-142)
|
(2500-196)
|
2304
|
35x65
|
(50-15)(50+15)
|
(502-152)
|
(2500-225)
|
2275
|
34x66
|
(50-16)(50+16)
|
(502-162)
|
(2500-256)
|
2244
|
33x67
|
(50-17)(50+17)
|
(502-172)
|
(2500-289)
|
2211
|
32x68
|
(50-18)(50+18)
|
(502-182)
|
(2500-324)
|
2176
|
31x69
|
(50-19)(50+19)
|
(502-192)
|
(2500-361)
|
2139
|
30x70
|
(50-20)(50+20)
|
(502-202)
|
(2500-400)
|
2100
|
29x71
|
(50-21)(50+21)
|
(502-212)
|
(2500-441)
|
2059
|
28x72
|
(50-22)(50+22)
|
(502-222)
|
(2500-484)
|
2016
|
27x73
|
(50-23)(50+23)
|
(502-232)
|
(2500-529)
|
1971
|
26x74
|
(50-24)(50+24)
|
(502-242)
|
(2500-576)
|
1924
|
25x75
|
(50-25)(50+25)
|
(502-252)
|
(2500-625)
|
1875
|
24x76
|
(50-26)(50+26)
|
(502-262)
|
(2500-676)
|
1824
|
23x77
|
(50-27)(50+27)
|
(502-272)
|
(2500-729)
|
1771
|
22x78
|
(50-28)(50+28)
|
(502-282)
|
(2500-784)
|
1716
|
21x79
|
(50-29)(50+29)
|
(502-292)
|
(2500-841)
|
1659
|
20x80
|
(50-30)(50+30)
|
(502-302)
|
(2500-900)
|
1600
|
19x81
|
(50-31)(50+31)
|
(502-312)
|
(2500-961)
|
1539
|
18x82
|
(50-32)(50+32)
|
(502-322)
|
(2500-1024)
|
1476
|
17x83
|
(50-33)(50+33)
|
(502-332)
|
(2500-1089)
|
1411
|
16x84
|
(50-34)(50+34)
|
(502-342)
|
(2500-1156)
|
1344
|
15x85
|
(50-35)(50+35)
|
(502-352)
|
(2500-1225)
|
1275
|
14x86
|
(50-36)(50+36)
|
(502-362)
|
(2500-1296)
|
1204
|
13x87
|
(50-37)(50+37)
|
(502-372)
|
(2500-1369)
|
1131
|
12x88
|
(50-38)(50+38)
|
(502-382)
|
(2500-1444)
|
1056
|
11x89
|
(50-39)(50+39)
|
(502-392)
|
(2500-1521)
|
979
|
Base number:60
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(3600).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
59x61
|
(60-1)(60+1)
|
(602-12)
|
(3600-1)
|
3599
|
58x62
|
(60-2)(60+2)
|
(602-22)
|
(3600-4)
|
3596
|
57x63
|
(60-3)(60+3)
|
(602-32)
|
(3600-9)
|
3591
|
56x64
|
(60-4)(60+4)
|
(602-42)
|
(3600-16)
|
3584
|
55x65
|
(60-5)(60+5)
|
(602-52)
|
(3600-25)
|
3575
|
54x66
|
(60-6)(60+6)
|
(602-62)
|
(3600-36)
|
3564
|
53x67
|
(60-7)(60+7)
|
(602-72)
|
(3600-49)
|
3551
|
52x68
|
(60-8)(60+8)
|
(602-82)
|
(3600-64)
|
3536
|
51x69
|
(60-9)(60+9)
|
(602-92)
|
(3600-81)
|
3519
|
50x70
|
(60-10)(60+10)
|
(602-102)
|
(3600-100)
|
3500
|
49x71
|
(60-11)(60+11)
|
(602-112)
|
(3600-121)
|
3479
|
48x72
|
(60-12)(60+12)
|
(602-122)
|
(3600-144)
|
3456
|
47x73
|
(60-13)(60+13)
|
(602-132)
|
(3600-169)
|
3431
|
46x74
|
(60-14)(60+14)
|
(602-142)
|
(3600-196)
|
3404
|
45x75
|
(60-15)(60+15)
|
(602-152)
|
(3600-225)
|
3375
|
44x76
|
(60-16)(60+16)
|
(602-162)
|
(3600-256)
|
3344
|
43x77
|
(60-17)(60+17)
|
(602-172)
|
(3600-289)
|
3311
|
42x78
|
(60-18)(60+18)
|
(602-182)
|
(3600-324)
|
3276
|
41x79
|
(60-19)(60+19)
|
(602-192)
|
(3600-361)
|
3239
|
40x80
|
(60-20)(60+20)
|
(602-202)
|
(3600-400)
|
3200
|
39x81
|
(60-21)(60+21)
|
(602-212)
|
(3600-441)
|
3159
|
38x82
|
(60-22)(60+22)
|
(602-222)
|
(3600-484)
|
3116
|
37x83
|
(60-23)(60+23)
|
(602-232)
|
(3600-529)
|
3071
|
36x84
|
(60-24)(60+24)
|
(602-242)
|
(3600-576)
|
3024
|
35x85
|
(60-25)(60+25)
|
(602-252)
|
(3600-625)
|
2975
|
34x86
|
(60-26)(60+26)
|
(602-262)
|
(3600-676)
|
2924
|
33x87
|
(60-27)(60+27)
|
(602-272)
|
(3600-729)
|
2871
|
32x88
|
(60-28)(60+28)
|
(602-282)
|
(3600-784)
|
2816
|
31x89
|
(60-29)(60+29)
|
(602-292)
|
(3600-841)
|
2759
|
30x90
|
(60-30)(60+30)
|
(602-302)
|
(3600-900)
|
2700
|
29x91
|
(60-31)(60+31)
|
(602-312)
|
(3600-961)
|
2639
|
28x92
|
(60-32)(60+32)
|
(602-322)
|
(3600-1024)
|
2576
|
27x93
|
(60-33)(60+33)
|
(602-332)
|
(3600-1089)
|
2511
|
26x94
|
(60-34)(60+34)
|
(602-342)
|
(3600-1156)
|
2444
|
25x95
|
(60-35)(60+35)
|
(602-352)
|
(3600-1225)
|
2375
|
Base number:70
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(4900).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
69x71
|
(70-1)(70+1)
|
(702-12)
|
(4900-1)
|
4899
|
68x72
|
(70-2)(70+2)
|
(702-22)
|
(4900-4)
|
4896
|
67x73
|
(70-3)(70+3)
|
(702-32)
|
(4900-9)
|
4891
|
66x74
|
(70-4)(70+4)
|
(702-42)
|
(4900-16)
|
4884
|
65x75
|
(70-5)(70+5)
|
(702-52)
|
(4900-25)
|
4875
|
64x76
|
(70-6)(70+6)
|
(702-62)
|
(4900-36)
|
4864
|
63x77
|
(70-7)(70+7)
|
(702-72)
|
(4900-49)
|
4851
|
62x78
|
(70-8)(70+8)
|
(702-82)
|
(4900-64)
|
4836
|
61x79
|
(70-9)(70+9)
|
(702-92)
|
(4900-81)
|
4819
|
60x80
|
(70-10)(70+10)
|
(702-102)
|
(4900-100)
|
4800
|
59x81
|
(70-11)(70+11)
|
(702-112)
|
(4900-121)
|
4779
|
58x82
|
(70-12)(70+12)
|
(702-122)
|
(4900-144)
|
4756
|
57x83
|
(70-13)(70+13)
|
(702-132)
|
(4900-169)
|
4731
|
56x84
|
(70-14)(70+14)
|
(702-142)
|
(4900-196)
|
4704
|
55x85
|
(70-15)(70+15)
|
(702-152)
|
(4900-225)
|
4675
|
54x86
|
(70-16)(70+16)
|
(702-162)
|
(4900-256)
|
4644
|
53x87
|
(70-17)(70+17)
|
(702-172)
|
(4900-289)
|
4611
|
52x88
|
(70-18)(70+18)
|
(702-182)
|
(4900-324)
|
4576
|
51x89
|
(70-19)(70+19)
|
(702-192)
|
(4900-361)
|
4539
|
50x90
|
(70-20)(70+20)
|
(702-202)
|
(4900-400)
|
4500
|
49x91
|
(70-21)(70+21)
|
(702-212)
|
(4900-441)
|
4459
|
48x92
|
(70-22)(70+22)
|
(702-222)
|
(4900-484)
|
4416
|
47x93
|
(70-23)(70+23)
|
(702-232)
|
(4900-529)
|
4371
|
46x94
|
(70-24)(70+24)
|
(702-242)
|
(4900-576)
|
4324
|
45x95
|
(70-25)(70+25)
|
(702-252)
|
(4900-625)
|
4275
|
44x96
|
(70-26)(70+26)
|
(702-262)
|
(4900-676)
|
4224
|
43x97
|
(70-27)(70+27)
|
(702-272)
|
(4900-729)
|
4171
|
42x98
|
(70-28)(70+28)
|
(702-282)
|
(4900-784)
|
4116
|
41x99
|
(70-29)(70+29)
|
(702-292)
|
(4900-841)
|
4059
|
40x100
|
(70-30)(70+30)
|
(702-302)
|
(4900-900)
|
4000
|
39x101
|
(70-31)(70+31)
|
(702-312)
|
(4900-961)
|
3939
|
38x102
|
(70-32)(70+32)
|
(702-322)
|
(4900-1024)
|
3876
|
37x103
|
(70-33)(70+33)
|
(702-332)
|
(4900-1089)
|
3811
|
36x104
|
(70-34)(70+34)
|
(702-342)
|
(4900-1156)
|
3744
|
35x105
|
(70-35)(70+35)
|
(702-352)
|
(4900-1225)
|
3675
|
34x106
|
(70-36)(70+36)
|
(702-362)
|
(4900-1296)
|
3604
|
33x107
|
(70-37)(70+37)
|
(702-372)
|
(4900-1369)
|
3531
|
32x108
|
(70-38)(70+38)
|
(702-382)
|
(4900-1444)
|
3456
|
31x109
|
(70-39)(70+39)
|
(702-392)
|
(4900-1521)
|
3379
|
Base number:80
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(6400).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
79x81
|
(80-1)(80+1)
|
(802-12)
|
(6400-1)
|
6399
|
78x82
|
(80-2)(80+2)
|
(802-22)
|
(6400-4)
|
6396
|
77x83
|
(80-3)(80+3)
|
(802-32)
|
(6400-9)
|
6391
|
76x84
|
(80-4)(80+4)
|
(802-42)
|
(6400-16)
|
6384
|
75x85
|
(80-5)(80+5)
|
(802-52)
|
(6400-25)
|
6375
|
74x86
|
(80-6)(80+6)
|
(802-62)
|
(6400-36)
|
6364
|
73x87
|
(80-7)(80+7)
|
(802-72)
|
(6400-49)
|
6351
|
72x88
|
(80-8)(80+8)
|
(802-82)
|
(6400-64)
|
6336
|
71x89
|
(80-9)(80+9)
|
(802-92)
|
(6400-81)
|
6319
|
70x90
|
(80-10)(80+10)
|
(802-102)
|
(6400-100)
|
6300
|
69x91
|
(80-11)(80+11)
|
(802-112)
|
(6400-121)
|
6279
|
68x92
|
(80-12)(80+12)
|
(802-122)
|
(6400-144)
|
6256
|
67x93
|
(80-13)(80+13)
|
(802-132)
|
(6400-169)
|
6231
|
66x94
|
(80-14)(80+14)
|
(802-142)
|
(6400-196)
|
6204
|
65x95
|
(80-15)(80+15)
|
(802-152)
|
(6400-225)
|
6175
|
64x96
|
(80-16)(80+16)
|
(802-162)
|
(6400-256)
|
6144
|
63x97
|
(80-17)(80+17)
|
(802-172)
|
(6400-289)
|
6111
|
62x98
|
(80-18)(80+18)
|
(802-182)
|
(6400-324)
|
6076
|
61x99
|
(80-19)(80+19)
|
(802-192)
|
(6400-361)
|
6039
|
60x100
|
(80-20)(80+20)
|
(802-202)
|
(6400-400)
|
6000
|
59x101
|
(80-21)(80+21)
|
(802-212)
|
(6400-441)
|
5959
|
58x102
|
(80-22)(80+22)
|
(802-222)
|
(6400-484)
|
5916
|
57x103
|
(80-23)(80+23)
|
(802-232)
|
(6400-529)
|
5871
|
56x104
|
(80-24)(80+24)
|
(802-242)
|
(6400-576)
|
5824
|
55x105
|
(80-25)(80+25)
|
(802-252)
|
(6400-625)
|
5775
|
54x106
|
(80-26)(80+26)
|
(802-262)
|
(6400-676)
|
5724
|
53x107
|
(80-27)(80+27)
|
(802-272)
|
(6400-729)
|
5671
|
52x108
|
(80-28)(80+28)
|
(802-282)
|
(6400-784)
|
5616
|
51x109
|
(80-29)(80+29)
|
(802-292)
|
(6400-841)
|
5559
|
50x110
|
(80-30)(80+30)
|
(802-302)
|
(6400-900)
|
5500
|
49x111
|
(80-31)(80+31)
|
(802-312)
|
(6400-961)
|
5439
|
48x112
|
(80-32)(80+32)
|
(802-322)
|
(6400-1024)
|
5376
|
47x113
|
(80-33)(80+33)
|
(802-332)
|
(6400-1089)
|
5311
|
46x114
|
(80-34)(80+34)
|
(802-342)
|
(6400-1156)
|
5244
|
45x115
|
(80-35)(80+35)
|
(802-352)
|
(6400-1225)
|
5175
|
44x116
|
(80-36)(80+36)
|
(802-362)
|
(6400-1296)
|
5104
|
43x117
|
(80-37)(80+37)
|
(802-372)
|
(6400-1369)
|
5031
|
42x118
|
(80-38)(80+38)
|
(802-382)
|
(6400-1444)
|
4956
|
41x119
|
(80-39)(80+39)
|
(802-392)
|
(6400-1521)
|
4879
|
Base number:90
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(8100).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
89x91
|
(90-1)(90+1)
|
(902-12)
|
(8100-1)
|
8099
|
88x92
|
(90-2)(90+2)
|
(902-22)
|
(8100-4)
|
8096
|
87x93
|
(90-3)(90+3)
|
(902-32)
|
(8100-9)
|
8091
|
86x94
|
(90-4)(90+4)
|
(902-42)
|
(8100-16)
|
8084
|
85x95
|
(90-5)(90+5)
|
(902-52)
|
(8100-25)
|
8075
|
84x96
|
(90-6)(90+6)
|
(902-62)
|
(8100-36)
|
8064
|
83x97
|
(90-7)(90+7)
|
(902-72)
|
(8100-49)
|
8051
|
82x98
|
(90-8)(90+8)
|
(902-82)
|
(8100-64)
|
8036
|
81x99
|
(90-9)(90+9)
|
(902-92)
|
(8100-81)
|
8019
|
80x100
|
(90-10)(90+10)
|
(902-102)
|
(8100-100)
|
8000
|
79x101
|
(90-11)(90+11)
|
(902-112)
|
(8100-121)
|
7979
|
78x102
|
(90-12)(90+12)
|
(902-122)
|
(8100-144)
|
7956
|
77x103
|
(90-13)(90+13)
|
(902-132)
|
(8100-169)
|
7931
|
76x104
|
(90-14)(90+14)
|
(902-142)
|
(8100-196)
|
7904
|
75x105
|
(90-15)(90+15)
|
(902-152)
|
(8100-225)
|
7875
|
74x106
|
(90-16)(90+16)
|
(902-162)
|
(8100-256)
|
7844
|
73x107
|
(90-17)(90+17)
|
(902-172)
|
(8100-289)
|
7811
|
72x108
|
(90-18)(90+18)
|
(902-182)
|
(8100-324)
|
7776
|
71x109
|
(90-19)(90+19)
|
(902-192)
|
(8100-361)
|
7739
|
70x110
|
(90-20)(90+20)
|
(902-202)
|
(8100-400)
|
7700
|
69x111
|
(90-21)(90+21)
|
(902-212)
|
(8100-441)
|
7659
|
68x112
|
(90-22)(90+22)
|
(902-222)
|
(8100-484)
|
7616
|
67x113
|
(90-23)(90+23)
|
(902-232)
|
(8100-529)
|
7571
|
66x114
|
(90-24)(90+24)
|
(902-242)
|
(8100-576)
|
7524
|
65x115
|
(90-25)(90+25)
|
(902-252)
|
(8100-625)
|
7475
|
64x116
|
(90-26)(90+26)
|
(902-262)
|
(8100-676)
|
7424
|
63x117
|
(90-27)(90+27)
|
(902-272)
|
(8100-729)
|
7371
|
62x118
|
(90-28)(90+28)
|
(902-282)
|
(8100-784)
|
7316
|
61x119
|
(90-29)(90+29)
|
(902-292)
|
(8100-841)
|
7259
|
60x120
|
(90-30)(90+30)
|
(902-302)
|
(8100-900)
|
7200
|
59x121
|
(90-31)(90+31)
|
(902-312)
|
(8100-961)
|
7139
|
58x122
|
(90-32)(90+32)
|
(902-322)
|
(8100-1024)
|
7076
|
57x123
|
(90-33)(90+33)
|
(902-332)
|
(8100-1089)
|
7011
|
56x124
|
(90-34)(90+34)
|
(902-342)
|
(8100-1156)
|
6944
|
55x125
|
(90-35)(90+35)
|
(902-352)
|
(8100-1225)
|
6875
|
54x126
|
(90-36)(90+36)
|
(902-362)
|
(8100-1296)
|
6804
|
53x127
|
(90-37)(90+37)
|
(902-372)
|
(8100-1369)
|
6731
|
52x128
|
(90-38)(90+38)
|
(902-382)
|
(8100-1444)
|
6656
|
51x129
|
(90-39)(90+39)
|
(902-392)
|
(8100-1521)
|
6579
|
Base number:100
By using formula (a+b)(a-b)=a2-b2 below table represent easy multiplication.Here only difficult thing is subtracting square numbers from square of base number(10000).In fourth column we are subtracting squared numbers from a square of base number. You need to practice fourth column perfectly so that you can this formula effectively.
99x101
|
(100-1)(100+1)
|
(1002-12)
|
(10000-1)
|
9999
|
98x102
|
(100-2)(100+2)
|
(1002-22)
|
(10000-4)
|
9996
|
97x103
|
(100-3)(100+3)
|
(1002-32)
|
(10000-9)
|
9991
|
96x104
|
(100-4)(100+4)
|
(1002-42)
|
(10000-16)
|
9984
|
95x105
|
(100-5)(100+5)
|
(1002-52)
|
(10000-25)
|
9975
|
94x106
|
(100-6)(100+6)
|
(1002-62)
|
(10000-36)
|
9964
|
93x107
|
(100-7)(100+7)
|
(1002-72)
|
(10000-49)
|
9951
|
92x108
|
(100-8)(100+8)
|
(1002-82)
|
(10000-64)
|
9936
|
91x109
|
(100-9)(100+9)
|
(1002-92)
|
(10000-81)
|
9919
|
90x110
|
(100-10)(100+10)
|
(1002-102)
|
(10000-100)
|
9900
|
89x111
|
(100-11)(100+11)
|
(1002-112)
|
(10000-121)
|
9879
|
88x112
|
(100-12)(100+12)
|
(1002-122)
|
(10000-144)
|
9856
|
87x113
|
(100-13)(100+13)
|
(1002-132)
|
(10000-169)
|
9831
|
86x114
|
(100-14)(100+14)
|
(1002-142)
|
(10000-196)
|
9804
|
85x115
|
(100-15)(100+15)
|
(1002-152)
|
(10000-225)
|
9775
|
84x116
|
(100-16)(100+16)
|
(1002-162)
|
(10000-256)
|
9744
|
83x117
|
(100-17)(100+17)
|
(1002-172)
|
(10000-289)
|
9711
|
82x118
|
(100-18)(100+18)
|
(1002-182)
|
(10000-324)
|
9676
|
81x119
|
(100-19)(100+19)
|
(1002-192)
|
(10000-361)
|
9639
|
80x120
|
(100-20)(100+20)
|
(1002-202)
|
(10000-400)
|
9600
|
79x121
|
(100-21)(100+21)
|
(1002-212)
|
(10000-441)
|
9559
|
78x122
|
(100-22)(100+22)
|
(1002-222)
|
(10000-484)
|
9516
|
77x123
|
(100-23)(100+23)
|
(1002-232)
|
(10000-529)
|
9471
|
76x124
|
(100-24)(100+24)
|
(1002-242)
|
(10000-576)
|
9424
|
75x125
|
(100-25)(100+25)
|
(1002-252)
|
(10000-625)
|
9375
|
74x126
|
(100-26)(100+26)
|
(1002-262)
|
(10000-676)
|
9324
|
73x127
|
(100-27)(100+27)
|
(1002-272)
|
(10000-729)
|
9271
|
72x128
|
(100-28)(100+28)
|
(1002-282)
|
(10000-784)
|
9216
|
71x129
|
(100-29)(100+29)
|
(1002-292)
|
(10000-841)
|
9159
|
70x130
|
(100-30)(100+30)
|
(1002-302)
|
(10000-900)
|
9100
|
69x131
|
(100-31)(100+31)
|
(1002-312)
|
(10000-961)
|
9039
|
68x132
|
(100-32)(100+32)
|
(1002-322)
|
(10000-1024)
|
8976
|
67x133
|
(100-33)(100+33)
|
(1002-332)
|
(10000-1089)
|
8911
|
66x134
|
(100-34)(100+34)
|
(1002-342)
|
(10000-1156)
|
8844
|
65x135
|
(100-35)(100+35)
|
(1002-352)
|
(10000-1225)
|
8775
|
64x136
|
(100-36)(100+36)
|
(1002-362)
|
(10000-1296)
|
8704
|
63x137
|
(100-37)(100+37)
|
(1002-372)
|
(10000-1369)
|
8631
|
62x138
|
(100-38)(100+38)
|
(1002-382)
|
(10000-1444)
|
8556
|
61x139
|
(100-39)(100+39)
|
(1002-392)
|
(10000-1521)
|
8479
|
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