Subtract 32/42 from 20/35, Solve 20/35

Subtract 32/42 from 20/35

20/35 - 32/42 is -4/21.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 42 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 35 × 6 = 210,
20/35 = 20 × 6/35 × 6 = 120/210
Likewise, for the 2nd fraction, since 42 × 5 = 210,
32/42 = 32 × 5/42 × 5 = 160/210
Subtract the two like fractions:
120/210 - 160/210 = 120 - 160/210 = -40/210
After reducing the fraction, the answer is -4/21

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