yes because the 4 is in the tenths place and if you move the zero off 6.40 its the same as 6.4.
Eg
3.09 is equivalent to 3.090. Both of the nines are in the hundredths place.
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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)