Subtract 20/32 from 20/42
20/42 - 20/32 is -25/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 32 is 672
Next, find the equivalent fraction of both fractional numbers with denominator 672 - For the 1st fraction, since 42 × 16 = 672,
20/42 = 20 × 16/42 × 16 = 320/672 - Likewise, for the 2nd fraction, since 32 × 21 = 672,
20/32 = 20 × 21/32 × 21 = 420/672 - Subtract the two like fractions:
320/672 - 420/672 = 320 - 420/672 = -100/672 - After reducing the fraction, the answer is -25/168
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