Subtract 72/35 from 9/20, Solve 9/20

Subtract 72/35 from 9/20

1^st number: 9/20, 2^nd number: 2 2/35

9/20 - 72/35 is -45/28.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 35 is 140

Next, find the equivalent fraction of both fractional numbers with denominator 140
For the 1st fraction, since 20 × 7 = 140,
9/20 = 9 × 7/20 × 7 = 63/140
Likewise, for the 2nd fraction, since 35 × 4 = 140,
72/35 = 72 × 4/35 × 4 = 288/140
Subtract the two like fractions:
63/140 - 288/140 = 63 - 288/140 = -225/140
After reducing the fraction, the answer is -45/28

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