Subtract 7/10 from 3/21
3/21 - 7/10 is -39/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
7/10 = 7 × 21/10 × 21 = 147/210 - Subtract the two like fractions:
30/210 - 147/210 = 30 - 147/210 = -117/210 - After reducing the fraction, the answer is -39/70
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