Subtract 21/7 from 7/80
1st number: 7/80, 2nd number: 3 0/7
7/80 - 21/7 is -233/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 7 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
7/80 = 7 × 7/80 × 7 = 49/560 - Likewise, for the 2nd fraction, since 7 × 80 = 560,
21/7 = 21 × 80/7 × 80 = 1680/560 - Subtract the two like fractions:
49/560 - 1680/560 = 49 - 1680/560 = -1631/560 - After reducing the fraction, the answer is -233/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/80-21/7 7/80-42/7 7/80-21/14 21/80-21/7 7/80-63/7 35/80-21/7 7/80-21/35 49/80-21/7 7/80-21/49