Subtract 28/21 from 42/70
1st number: 42/70, 2nd number: 1 7/21
42/70 - 28/21 is -11/15.
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,
42/70 = 42 × 3/70 × 3 = 126/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
28/21 = 28 × 10/21 × 10 = 280/210 - Subtract the two like fractions:
126/210 - 280/210 = 126 - 280/210 = -154/210 - After reducing the fraction, the answer is -11/15
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