Subtract 42/49 from 21/35
21/35 - 42/49 is -9/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 49 is 245
Next, find the equivalent fraction of both fractional numbers with denominator 245 - For the 1st fraction, since 35 × 7 = 245,
21/35 = 21 × 7/35 × 7 = 147/245 - Likewise, for the 2nd fraction, since 49 × 5 = 245,
42/49 = 42 × 5/49 × 5 = 210/245 - Subtract the two like fractions:
147/245 - 210/245 = 147 - 210/245 = -63/245 - After reducing the fraction, the answer is -9/35
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