Subtract 56/90 from 1/21
1/21 - 56/90 is -181/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
1/21 = 1 × 30/21 × 30 = 30/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
56/90 = 56 × 7/90 × 7 = 392/630 - Subtract the two like fractions:
30/630 - 392/630 = 30 - 392/630 = -362/630 - After reducing the fraction, the answer is -181/315
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