Subtract 4/21 from 40/12
1st number: 3 4/12, 2nd number: 4/21
40/12 - 4/21 is 22/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
40/12 = 40 × 7/12 × 7 = 280/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
4/21 = 4 × 4/21 × 4 = 16/84 - Subtract the two like fractions:
280/84 - 16/84 = 280 - 16/84 = 264/84 - After reducing the fraction, the answer is 22/7
- In mixed form: 31/7
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