Subtract 3/40 from 21/27
21/27 - 3/40 is 253/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 40 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 27 × 40 = 1080,
21/27 = 21 × 40/27 × 40 = 840/1080 - Likewise, for the 2nd fraction, since 40 × 27 = 1080,
3/40 = 3 × 27/40 × 27 = 81/1080 - Subtract the two like fractions:
840/1080 - 81/1080 = 840 - 81/1080 = 759/1080 - After reducing the fraction, the answer is 253/360
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