Subtract 21/9 from 42/27
1st number: 1 15/27, 2nd number: 2 3/9
42/27 - 21/9 is -7/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 9 is 27
Next, find the equivalent fraction of both fractional numbers with denominator 27 - For the 1st fraction, since 27 × 1 = 27,
42/27 = 42 × 1/27 × 1 = 42/27 - Likewise, for the 2nd fraction, since 9 × 3 = 27,
21/9 = 21 × 3/9 × 3 = 63/27 - Subtract the two like fractions:
42/27 - 63/27 = 42 - 63/27 = -21/27 - After reducing the fraction, the answer is -7/9
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