Subtract 7/10 from 21/25
21/25 - 7/10 is 7/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 10 is 50
Next, find the equivalent fraction of both fractional numbers with denominator 50 - For the 1st fraction, since 25 × 2 = 50,
21/25 = 21 × 2/25 × 2 = 42/50 - Likewise, for the 2nd fraction, since 10 × 5 = 50,
7/10 = 7 × 5/10 × 5 = 35/50 - Subtract the two like fractions:
42/50 - 35/50 = 42 - 35/50 = 7/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25-7/10 21/25-14/10 21/50-7/10 21/25-7/20 63/25-7/10 21/25-21/10 21/75-7/10 21/25-7/30 21/25-35/10 21/25-7/50 21/25-49/10 21/25-7/70