Subtract 70/7 from 21/2
1st number: 10 1/2, 2nd number: 10 0/7
21/2 - 70/7 is 1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 7 is 14
Next, find the equivalent fraction of both fractional numbers with denominator 14 - For the 1st fraction, since 2 × 7 = 14,
21/2 = 21 × 7/2 × 7 = 147/14 - Likewise, for the 2nd fraction, since 7 × 2 = 14,
70/7 = 70 × 2/7 × 2 = 140/14 - Subtract the two like fractions:
147/14 - 140/14 = 147 - 140/14 = 7/14 - After reducing the fraction, the answer is 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-70/7 21/4-70/7 21/2-70/14 63/2-70/7 21/6-70/7 21/2-70/21 21/10-70/7 21/2-70/35 21/14-70/7 21/2-70/49