Subtract 21/54 from 20/7
1st number: 2 6/7, 2nd number: 21/54
20/7 - 21/54 is 311/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 7 × 54 = 378,
20/7 = 20 × 54/7 × 54 = 1080/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Subtract the two like fractions:
1080/378 - 147/378 = 1080 - 147/378 = 933/378 - After reducing the fraction, the answer is 311/126
- In mixed form: 259/126
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