Subtract 7/40 from 45/54
45/54 - 7/40 is 79/120.
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,
45/54 = 45 × 20/54 × 20 = 900/1080 - Likewise, for the 2nd fraction, since 40 × 27 = 1080,
7/40 = 7 × 27/40 × 27 = 189/1080 - Subtract the two like fractions:
900/1080 - 189/1080 = 900 - 189/1080 = 711/1080 - After reducing the fraction, the answer is 79/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/54-7/40 45/54-14/40 45/54-7/80 45/54-21/40 45/54-35/40 45/54-49/40