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To do this, the formula is:

The whole number part of the mixed number is found by dividing the 156 by the 117.

In this case we get 1.

The fractional part of the mixed number is found by using the remainder of the division,

which in this case is 39 (156 divided by 117 is 1 remainder 39).

The fraction 1 39/117 is not reduced to lowest terms. We can reduce this fraction to lowest terms by dividing both the numerator and denominator by 39.

39 is the Greatest Common Divisor (GCD)

or Greatest Common Factor (GCF) of the numbers 39 and 117.

117 / 117 = 1

117 / 39 = 3

So the answer is 1 and 1/3