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Earn +20 ptsQ: Why does the divisibility rule work for 9?
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Why does divisibility rule for 9 work?
add all the digits together and see if it is divisible by nine.
What is the rule for divisibility of 3?
It is 3 6 9
Do multiples of 9 add up to 9?
Yes. It is the divisibility rule for 9.
What divisibility rules were combined to make the divisibility rule of 36?
You have to use the rules of 4 and 9 Using the rules of 2 and 18 won't work because the smallest common multiple of 2 and 18 is 18 not 36. 3 and 12 won't work either because the smallest common multiple of 3 and 12 is 12 not 36. However 4 and 9 does work because their biggest common divisor is 1 so multiplying them works. The biggest common divisor of 2 and 18 is 2 and the biggest common divisor of 3 and 12 is 3
How can you check if a number is divisible by 9 when usiing the divisibility rule for 9?
If all the digits add up to 9 then it is divisable by 9
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