Subtract 21/10 from 28/7
1st number: 4 0/7, 2nd number: 2 1/10
28/7 - 21/10 is 19/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,
28/7 = 28 × 10/7 × 10 = 280/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Subtract the two like fractions:
280/70 - 147/70 = 280 - 147/70 = 133/70 - After reducing the fraction, the answer is 19/10
- In mixed form: 19/10
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