Subtract 4/21 from 80/42
1st number: 1 38/42, 2nd number: 4/21
80/42 - 4/21 is 12/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
80/42 = 80 × 1/42 × 1 = 80/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
4/21 = 4 × 2/21 × 2 = 8/42 - Subtract the two like fractions:
80/42 - 8/42 = 80 - 8/42 = 72/42 - After reducing the fraction, the answer is 12/7
- In mixed form: 15/7
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