Subtract 28/80 from 16/70, Solve 16/70

Subtract 28/80 from 16/70

16/70 - 28/80 is -17/140.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 70 × 8 = 560,
16/70 = 16 × 8/70 × 8 = 128/560
Likewise, for the 2nd fraction, since 80 × 7 = 560,
28/80 = 28 × 7/80 × 7 = 196/560
Subtract the two like fractions:
128/560 - 196/560 = 128 - 196/560 = -68/560
After reducing the fraction, the answer is -17/140

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