Subtract 28/70 from 21/2
1st number: 10 1/2, 2nd number: 28/70
21/2 - 28/70 is 101/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 2 × 35 = 70,
21/2 = 21 × 35/2 × 35 = 735/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
28/70 = 28 × 1/70 × 1 = 28/70 - Subtract the two like fractions:
735/70 - 28/70 = 735 - 28/70 = 707/70 - After reducing the fraction, the answer is 101/10
- In mixed form: 101/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-28/70 21/2-56/70 21/4-28/70 63/2-28/70 21/2-84/70 21/6-28/70 21/10-28/70 21/14-28/70