Subtract 21/10 from 7/28
1st number: 7/28, 2nd number: 2 1/10
7/28 - 21/10 is -37/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 10 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
7/28 = 7 × 5/28 × 5 = 35/140 - Likewise, for the 2nd fraction, since 10 × 14 = 140,
21/10 = 21 × 14/10 × 14 = 294/140 - Subtract the two like fractions:
35/140 - 294/140 = 35 - 294/140 = -259/140 - After reducing the fraction, the answer is -37/20
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