Subtract 3/21 from 4/70
4/70 - 3/21 is -3/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
4/70 = 4 × 3/70 × 3 = 12/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Subtract the two like fractions:
12/210 - 30/210 = 12 - 30/210 = -18/210 - After reducing the fraction, the answer is -3/35
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