Subtract 63/70 from 12/21
12/21 - 63/70 is -23/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
12/21 = 12 × 10/21 × 10 = 120/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
63/70 = 63 × 3/70 × 3 = 189/210 - Subtract the two like fractions:
120/210 - 189/210 = 120 - 189/210 = -69/210 - After reducing the fraction, the answer is -23/70
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