Subtract 21/5 from 7/2
1st number: 3 1/2, 2nd number: 4 1/5
72 - 215 is -710.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 5 is 10
Next, find the equivalent fraction of both fractional numbers with denominator 10 - For the 1st fraction, since 2 × 5 = 10,
72 = 7 × 52 × 5 = 3510 - Likewise, for the 2nd fraction, since 5 × 2 = 10,
215 = 21 × 25 × 2 = 4210 - Subtract the two like fractions:
3510 - 4210 = 35 - 4210 = -710
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2-21/5 7/2-42/5 7/4-21/5 7/2-21/10 21/2-21/5 7/2-63/5 7/6-21/5 7/2-21/15 35/2-21/5 7/10-21/5 7/2-21/25 49/2-21/5 7/14-21/5 7/2-21/35