DIVISIBLITY RULES

Divisibility rules let you test if one number is divisible by another, without having to do too much calculation!

As we can say a number divisible by 2 when the last digit is even i.e 0,2,4,6,8.  For example : 22, 66, 88 etc.
Same as for 3, the sum of the digits is divisible by 3. For example : 27-2+7=9 is divisible by 3.
For 4, the last 2 digits are divisible by 4, or the number contains 00 (two zeros) or more than two zeros at the end. For example : 48, 4800, 56000 etc.
For 5, the last digit is 0 or 5. For example : 20, 55, 110 etc. 
For 6 the number is divisible by both 2 and 3. For example : 12, 18, 66, 102 as each number is divisible by 2 and 3 both.
For 7, double the last digit and subtract it from a number made by the other digits. The result either must be divisible by 7 or 0 (zero) is divisible by 7. For example : 658 - 65-2 * 8 = 65-16 = 49.
For 8, the last three digits are divisible by 8. As well as if the last three or more digits of a number are 0 (zeros), then also the number is perfectly divisible by 8. For example : 2256- 56 is divisible by 8; 632 - 32 is divisible by 8.
For 9, the sum of all the digits is divisible by 9. For example : 369 3+6+9=18, 63189 6+3+1+8+9=27.
For 10, the number ends with 0. For example : 20, 40, 1050 etc

When a number is divisible by another number then it is also divisible by each of the factors of that number.

 

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