Subtract 21/40 from 8/54
8/54 - 21/40 is -407/1080.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 40 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 54 × 20 = 1080,
8/54 = 8 × 20/54 × 20 = 160/1080 - Likewise, for the 2nd fraction, since 40 × 27 = 1080,
21/40 = 21 × 27/40 × 27 = 567/1080 - Subtract the two like fractions:
160/1080 - 567/1080 = 160 - 567/1080 = -407/1080
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