Subtract 21/4 from 7/28
1st number: 7/28, 2nd number: 5 1/4
7/28 - 21/4 is -5/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 4 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
7/28 = 7 × 1/28 × 1 = 7/28 - Likewise, for the 2nd fraction, since 4 × 7 = 28,
21/4 = 21 × 7/4 × 7 = 147/28 - Subtract the two like fractions:
7/28 - 147/28 = 7 - 147/28 = -140/28 - After reducing the fraction, the answer is -5/1
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