Subtract 25/42 from 20/40
20/40 - 25/42 is -2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
20/40 = 20 × 21/40 × 21 = 420/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
25/42 = 25 × 20/42 × 20 = 500/840 - Subtract the two like fractions:
420/840 - 500/840 = 420 - 500/840 = -80/840 - After reducing the fraction, the answer is -2/21
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