Factoring
For example,
Here are some divisibility rules that should help: Divisibility by 2: If the number ends in 0,2,4,6, or 8, it is divisible by 2. Divisibility by 3: If the sum of the digits is divisible by 3, the number is divisible by 3. Example: 27 is divisible by 3 because 2 + 7 = 9, which is divisible by 3. Divisibility by 4: If the last two digits are divisible by 4. Divisibility by 5: If the number ends in 0 or 5, it is divisible by 5. Divisibility by 6: If the number is divisible by 2 and 3. Divisibility by 9: If the sum of the digits is divisible by 9. Divisibility by 10: If the last digit is 0.
Examples:
Find all the factors of each number in increasing order. Example: The factors of 10 are "1 2 5 10". 12 25 28 31
12 25 28 31
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