Arithmetic1

Problems on volume and surface area of cubes Number 10 20 30 40 50 60 70 80 90 100 Cube 1000 8000 27000 640000 125000 216000 343000 512000 729000 100000 By observing the above table 1.        If the cube is below 1000 then the cuberoot  is below 10 2.        If the cube is between 1000 to 8000, then the cuberooe is between 11 to 20. 3.        If the cube is between 8001 to 27000, then the cuberoot is between 21 to 30 4.        If the cube is between 27001 to 64000, then the cuberoot  is between 31 to 40 5.        If the cube is between 64001 to 125000, then the cuberoot  is between 41 to 50. 6.      ...

The following table describes the cubes of the numbers. The first column represents the number. Second column represents the cube . the third column represents the last digit of the cube. The fourth column represents the sum of the digits of the cube.By observing the table we can observe many things. The sum of the digits in the cube are 1,8,9. If we see the last column 1,8,9 are repeating every time. Yes it is a great magic on cubes.               If we observe the column number three,which is the sum of the digits in a cube, the series follows 1,8,7,4,5,6,3,2,9,0. For every 10 cubes the same sequence is following. So this is a great magic.  Number Cube of a number Last digit in the number Sum of the digits in the cube 1 1 1 1 2 8 8 8 3 27 7 9 4 64 4 1 5 125 5 8 ...