Subtract 21/25 from 8/40
8/40 - 21/25 is -16/25.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 25 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 40 × 5 = 200,
8/40 = 8 × 5/40 × 5 = 40/200 - Likewise, for the 2nd fraction, since 25 × 8 = 200,
21/25 = 21 × 8/25 × 8 = 168/200 - Subtract the two like fractions:
40/200 - 168/200 = 40 - 168/200 = -128/200 - After reducing the fraction, the answer is -16/25
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/40-21/25 8/40-42/25 8/80-21/25 8/40-21/50 24/40-21/25 8/40-63/25 8/40-21/75 56/40-21/25