Subtract 15/70 from 40/21
1st number: 1 19/21, 2nd number: 15/70
40/21 - 15/70 is 71/42.
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,
40/21 = 40 × 10/21 × 10 = 400/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
15/70 = 15 × 3/70 × 3 = 45/210 - Subtract the two like fractions:
400/210 - 45/210 = 400 - 45/210 = 355/210 - After reducing the fraction, the answer is 71/42
- In mixed form: 129/42
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