Subtract 10/80 from 21/7
1st number: 3 0/7, 2nd number: 10/80
21/7 - 10/80 is 23/8.
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,
21/7 = 21 × 80/7 × 80 = 1680/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
10/80 = 10 × 7/80 × 7 = 70/560 - Subtract the two like fractions:
1680/560 - 70/560 = 1680 - 70/560 = 1610/560 - After reducing the fraction, the answer is 23/8
- In mixed form: 27/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-10/80 21/7-20/80 21/14-10/80 63/7-10/80 21/7-30/80 21/7-50/80 21/35-10/80 21/7-70/80 21/49-10/80