Subtract 45/40 from 3/7
1st number: 3/7, 2nd number: 1 5/40
3/7 - 45/40 is -39/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
3/7 = 3 × 40/7 × 40 = 120/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
45/40 = 45 × 7/40 × 7 = 315/280 - Subtract the two like fractions:
120/280 - 315/280 = 120 - 315/280 = -195/280 - After reducing the fraction, the answer is -39/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-45/40 3/7-90/40 3/14-45/40 3/7-45/80 9/7-45/40 3/21-45/40 15/7-45/40 3/35-45/40 21/7-45/40 3/49-45/40