easy maths question

When you multiply decimals together, the product will have as many digits to the right of the decimal as do the factors combined. For example,

.2 * .2 = .04

because the two factors each have 1 digit to the right of the decimal. Therefore, the product will have 1+1 = 2 digits to the right.

Similarly, .04*.04*.04 = .000064 because each of the 3 factors has 2 digits to the right of the decimal, so the product has 2+2+2 = 6 digits to the right.

I have a similar problem.
When I'm not sure, I just think of it as a regular multiplication (which it is anyway) and just count the # of decimal places in the number I'm multiplying.

So, for the cubic root of 0.000064 ==> 0.04.
when you multiply .04 by itself 3 times, you have to move the decimal 6 places to the left (2 decimal places in .04 * 3 times).

Likewise for the square root of 0.04 = 0.2, if you multiply that twice you get .04



I think this was the answer to your question