lets say what = x
so
10*x=4
4/10=x
x=0.4
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It can also be expresses as 4x10x10x10x10x10 which equals 400,000.
The easiest way to do this question is not to think of it as multiplying by 0.2, but by multiplying it by two and then dividing it by ten. Thirty-two times two equals sixty-four, and sixty-four divided by ten equals six-point-four.
Ten times nine equals ninety.
Ten times four is forty ! (10x4=40)
Fourteen minus four equals ten...