Subtract 28/49 from 12/42
12/42 - 28/49 is -2/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 49 is 294
Next, find the equivalent fraction of both fractional numbers with denominator 294 - For the 1st fraction, since 42 × 7 = 294,
12/42 = 12 × 7/42 × 7 = 84/294 - Likewise, for the 2nd fraction, since 49 × 6 = 294,
28/49 = 28 × 6/49 × 6 = 168/294 - Subtract the two like fractions:
84/294 - 168/294 = 84 - 168/294 = -84/294 - After reducing the fraction, the answer is -2/7
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