Factors: : numbers that multiply to make another number., , Greatest Common Factor (GCF), 16 = 1, 2, 4, 8, 16, Organized list, , Multiples: 4, 8, 12, 16, 20, ..., Organized list (Horizontal T-chart), Number Line, Skip counting, Repeated addition, Word problems, Prime Factorization: Factor Tree, Only prime numbers, 20 = 22 x 5, Exponential form, Expanded form, 20 = 2 x 2 x 5,

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