yes these are equivalent
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64 times (640 ÷ 10 = 64).
(1/64) of 640 = (1/64) of 64*10 But 1/64 of 64 = 1 So the answer is 1 of 10 which is 10.
64
There are 4 tens in 640 or 640/10 = 64
sqrt(640) = sqrt(64*10) = sqrt(64)*sqrt(10) = 8*sqrt(10)