A number is divisible by 4 if and only if its last two digits are divisible by 4. For example, 53112 is divisible by 4, because the last two digits (12) are divisible by 4.
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i think divisibility rules help with fractions because it helps you reduce the fraction to make i a simple fraction.
3 and 9. And they divide into 123456789 whether or not you use divisibility rules!
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If a number is divisible by 3, and also by 4, then it is divisible by 12 - so you might use the divisibility rules for those two numbers. Although it might be simpler just to perform the division.
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