Subtract 42/45 from 20/28
20/28 - 42/45 is -23/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 45 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
20/28 = 20 × 45/28 × 45 = 900/1260 - Likewise, for the 2nd fraction, since 45 × 28 = 1260,
42/45 = 42 × 28/45 × 28 = 1176/1260 - Subtract the two like fractions:
900/1260 - 1176/1260 = 900 - 1176/1260 = -276/1260 - After reducing the fraction, the answer is -23/105
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