Subtract 21/42 from 20/9
1st number: 2 2/9, 2nd number: 21/42
20/9 - 21/42 is 31/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 9 × 14 = 126,
20/9 = 20 × 14/9 × 14 = 280/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
21/42 = 21 × 3/42 × 3 = 63/126 - Subtract the two like fractions:
280/126 - 63/126 = 280 - 63/126 = 217/126 - After reducing the fraction, the answer is 31/18
- In mixed form: 113/18
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