Subtract 45/80 from 3/7
3/7 - 45/80 is -15/112.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 7 × 80 = 560,
3/7 = 3 × 80/7 × 80 = 240/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
45/80 = 45 × 7/80 × 7 = 315/560 - Subtract the two like fractions:
240/560 - 315/560 = 240 - 315/560 = -75/560 - After reducing the fraction, the answer is -15/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-45/80 3/7-90/80 3/14-45/80 9/7-45/80 3/21-45/80 15/7-45/80 3/35-45/80 21/7-45/80 3/49-45/80