Subtract 9/10 from 42/49
42/49 - 9/10 is -3/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 10 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 49 × 10 = 490,
42/49 = 42 × 10/49 × 10 = 420/490 - Likewise, for the 2nd fraction, since 10 × 49 = 490,
9/10 = 9 × 49/10 × 49 = 441/490 - Subtract the two like fractions:
420/490 - 441/490 = 420 - 441/490 = -21/490 - After reducing the fraction, the answer is -3/70
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