Subtract 72/21 from 7/28
1st number: 7/28, 2nd number: 3 9/21
7/28 - 72/21 is -89/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
7/28 = 7 × 3/28 × 3 = 21/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
72/21 = 72 × 4/21 × 4 = 288/84 - Subtract the two like fractions:
21/84 - 288/84 = 21 - 288/84 = -267/84 - After reducing the fraction, the answer is -89/28
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