Subtract 21/54 from 30/21
1st number: 1 9/21, 2nd number: 21/54
30/21 - 21/54 is 131/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
30/21 = 30 × 18/21 × 18 = 540/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Subtract the two like fractions:
540/378 - 147/378 = 540 - 147/378 = 393/378 - After reducing the fraction, the answer is 131/126
- In mixed form: 15/126
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