Subtract 45/40 from 21/15
1st number: 1 6/15, 2nd number: 1 5/40
21/15 - 45/40 is 11/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
21/15 = 21 × 8/15 × 8 = 168/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
45/40 = 45 × 3/40 × 3 = 135/120 - Subtract the two like fractions:
168/120 - 135/120 = 168 - 135/120 = 33/120 - After reducing the fraction, the answer is 11/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-45/40 21/15-90/40 21/30-45/40 21/15-45/80 63/15-45/40 21/45-45/40 21/75-45/40