Knowing divisibility rules saves you a lot of time. Rules: Divisible by 2: last digit and even number Divisible by 3: sum of the digits is a multiple of 3 Divisible by 5: last digit is a 5 or 0 Divisible by 6: the sum of the digits is divisible by 3 and 2. Divisible by 9: sum of the digits is a multiple of 9 Divisible by 10: last digit is a 0
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