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Divisibility RulesDivisibility Rules are derived from Arithmetics and knowing by heart the multiplication table of the first 10 numbers and some basic additions is just what you need. Divisibility is the division of two numbers without remainder. The question is if a number is divisible (without remainder) by 1,2,3,4,5,6,7,8 or 9. Here a modified table from Wikipedia which explain the divisibility rules. To check if a number is divisible by 3, check the rule under the column "divisor" and look for number "3".
There are other divisibility rules for higher numbers. Wikipedia offers number from 10 to 20 as well. From divisibility rules back to fractions as measure

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