Subtract 84/54 from 28/21
1st number: 1 7/21, 2nd number: 1 30/54
28/21 - 84/54 is -2/9.
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,
28/21 = 28 × 18/21 × 18 = 504/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
84/54 = 84 × 7/54 × 7 = 588/378 - Subtract the two like fractions:
504/378 - 588/378 = 504 - 588/378 = -84/378 - After reducing the fraction, the answer is -2/9
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