Closurewhat I have learned: What are the rules to follow if a number is divisible by 42 What are the rules to follow if a number is divisible by 89 What are the rules to follow if a number is divisible by 112 What are the rules to follow if a number is divisible by 122 What are the rules to follow if a number is divisible by 72
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Divisibility rules for numbers 1–30
Divisor Divisibility condition
7 Adding 5 times the last digit to the rest gives a multiple of 7. (Works because 49 is divisible by 7.)
Subtracting 2 times the last digit from the rest gives a multiple of 7. (Works because 21 is divisible by 7.)