Using the rules of divisibility

How to use the rules of divisibility Dividing by 2 If the last digit of the number is even then it is divisible by 2. 36 ends in a 6 so it is divisible by 2 Dividing by 3 you add all the digits together then see if that is divisible by 3, if it is divisible by 3 then the original number is also divisible by 3 1 + 3 + 5 = 9 which is divisible by 3, so 135 is also divisible by 3 Dividing by 4 this is a little harder than dividing by 2, as you need to look at the last two digits together, then see if that is divisible by 4. Divide 136 by 4 the last two digits are 36 so 36/9 = 4 which means 136 is divisible by 4. Dividing by 5 you just need to know if the last digit is a 0 or a 5. the last digit ia a 6 so 136/5 is not divisible by 5. Dividing by 6 this is a combination of dividing by 2 and by 3, since 2 x 3 = 6, so the last digit must be even and then all the digits must add up to 9 Divide 186 by 6 the last digit ia a 6 which is even so we then check if the sum of all the digits is divisible by 3, 1 + 8 + 6 = 15 so 186 is divisible by 6 Buy Collins Primary Maths Books here!
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