Subtract 21/10 from 28/70
1st number: 28/70, 2nd number: 2 1/10
28/70 - 21/10 is -17/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
28/70 = 28 × 1/70 × 1 = 28/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Subtract the two like fractions:
28/70 - 147/70 = 28 - 147/70 = -119/70 - After reducing the fraction, the answer is -17/10
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