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When entering fifth grade, your child should be able to identify whether a number is prime or composite and find all the factor pairs for a whole number between 1 and 100. Factors are the numbers that can be multiplied together to reach another number. For example, the factor pairs for 6 are 1 and 6 (because 1 x 6 = 6) and 2 and 3 (because 2 x 3 = 6).