Walkabout wrote:
\(\frac{(0.0036)(2.8)}{(0.04)(0.1)(0.003)}=\)
(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084
Lets just turn everything into a whole number to make it easier.
Remember, when moving decimals within an division or multiplication problem we have to abide by the following rules:
When multiplying we have to move the decimal in the opposite direction of the two figures we are multiplying to keep the problem true to its original form. Ex: .002 * 567=1.134 is the same as 2 * .567 =1.134 if we move the decimal to the right side of the multiplication symbol you have to do the opposite to the whatever is on the left side to keep the multiplication true. This is the opposite when we divide. Whatever we do in the numerator we do in the denominator. For example this problem:
(0.0036)(2.8)/(0.04)(0.1)(0.003)
I make the denominator all integers by moving a total of 6 places to the right. Denominator = 4*1*3
I then have to do the same in the numerator to make the equation true to its original form =36*280
36*280/4*1*3=840