Subtract 8/15 from 21/70
21/70 - 8/15 is -7/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
8/15 = 8 × 14/15 × 14 = 112/210 - Subtract the two like fractions:
63/210 - 112/210 = 63 - 112/210 = -49/210 - After reducing the fraction, the answer is -7/30
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