Subtract 72/35 from 30/80, Solve 30/80

Subtract 72/35 from 30/80

1^st number: 30/80, 2^nd number: 2 2/35

30/80 - 72/35 is -471/280.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 35 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 80 × 7 = 560,
30/80 = 30 × 7/80 × 7 = 210/560
Likewise, for the 2nd fraction, since 35 × 16 = 560,
72/35 = 72 × 16/35 × 16 = 1152/560
Subtract the two like fractions:
210/560 - 1152/560 = 210 - 1152/560 = -942/560
After reducing the fraction, the answer is -471/280

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