Subtract 15/40 from 21/25
21/25 - 15/40 is 93/200.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 40 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 25 × 8 = 200,
21/25 = 21 × 8/25 × 8 = 168/200 - Likewise, for the 2nd fraction, since 40 × 5 = 200,
15/40 = 15 × 5/40 × 5 = 75/200 - Subtract the two like fractions:
168/200 - 75/200 = 168 - 75/200 = 93/200
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25-15/40 21/25-30/40 21/50-15/40 21/25-15/80 63/25-15/40 21/25-45/40 21/75-15/40 21/25-75/40