It's the concept of multiplicative identity, also called unity: for any number N, N x 1 = N.
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Yes. This only works for multiplication and addition.
16 = 1 x 16 = 2 x 8 = 4 x 4
They are: 2 times 4 = 8 or 1 times 8 = 8
×4 = 4×6 what is the property o that we were using?
4*5=201*20=2010*2=20