Subtract 21/4 from 90/28
1st number: 3 6/28, 2nd number: 5 1/4
90/28 - 21/4 is -57/28.
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,
90/28 = 90 × 1/28 × 1 = 90/28 - Likewise, for the 2nd fraction, since 4 × 7 = 28,
21/4 = 21 × 7/4 × 7 = 147/28 - Subtract the two like fractions:
90/28 - 147/28 = 90 - 147/28 = -57/28
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