Factors are numbers you can multiply together to get another number.
16: (1, 16) (2, 8) (4, 4)
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(16,1)(8,2)(4,4)
Factor pairs are any two numbers being multiplied to give you a certain number. Factor Pairs of 16: 8x2, 4x4, and 16x1.
The factor pairs of 18 are (1 x 18), (2 x 9), (3 x 6)
The factor pairs of 112 are 1*112, 2*56, 4*28, 7*16, and 8*14
There are 5 factor pairs of 256.256 = 1 x 256256 = 2 x 128256 = 4 x 64256 = 8 x 32256 = 16 x 16