You take the square root.
sqrt(16) = 4 and 42 = 16
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Half it... eg. 16 / 2 = 8, then half again... eg. 8 / 2 = 4
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Divide by 4.
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You can divide 16 by 4 to get you 4
Divide by 2 = 8 Divide by 4 = 4
16/4=4 and 16/8=2
You can divide it by 4 (4 being 16's square root). Or you can divide it by 8. Also you can divide it by 2 because all even numbers are divisible by 2.
1, 2, 4, 8, 16.