Subtract 20/3 from 21/42
1st number: 21/42, 2nd number: 6 2/3
21/42 - 20/3 is -37/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 3 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Likewise, for the 2nd fraction, since 3 × 14 = 42,
20/3 = 20 × 14/3 × 14 = 280/42 - Subtract the two like fractions:
21/42 - 280/42 = 21 - 280/42 = -259/42 - After reducing the fraction, the answer is -37/6
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