84 divide by 112 = 0.75
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84
Move the decimal in both numbers 1 spot to the right. 112 becomes 1120 and 8.40 becomes 84 Then, you can divide 1120 by 84 is 13.333 (repeating decimal) The reason you can do the first step is because you are multiplying both the numerator and the denominator by 10, which is the same as multiplying them by one.
75% of 112= 75% * 112= 0.75 * 112= 84
The greatest common factor (GCF) of 36, 84, 112, is 4.
112