Subtract 90/18 from 7/21
1st number: 7/21, 2nd number: 5 0/18
7/21 - 90/18 is -14/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
7/21 = 7 × 6/21 × 6 = 42/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Subtract the two like fractions:
42/126 - 630/126 = 42 - 630/126 = -588/126 - After reducing the fraction, the answer is -14/3
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