Subtract 21/40 from 3/54
3/54 - 21/40 is -169/360.
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,
3/54 = 3 × 20/54 × 20 = 60/1080 - Likewise, for the 2nd fraction, since 40 × 27 = 1080,
21/40 = 21 × 27/40 × 27 = 567/1080 - Subtract the two like fractions:
60/1080 - 567/1080 = 60 - 567/1080 = -507/1080 - After reducing the fraction, the answer is -169/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/54-21/40 3/54-42/40 3/54-21/80 9/54-21/40 3/54-63/40 15/54-21/40 21/54-21/40