Subtract 21/5 from 70/4
1st number: 17 2/4, 2nd number: 4 1/5
70/4 - 21/5 is 133/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
70/4 = 70 × 5/4 × 5 = 350/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
21/5 = 21 × 4/5 × 4 = 84/20 - Subtract the two like fractions:
350/20 - 84/20 = 350 - 84/20 = 266/20 - After reducing the fraction, the answer is 133/10
- In mixed form: 133/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/4-42/5 70/8-21/5 70/4-21/10 70/4-63/5 70/12-21/5 70/4-21/15 70/20-21/5 70/4-21/25 70/28-21/5 70/4-21/35