Subtract 3/40 from 12/15
12/15 - 3/40 is 29/40.
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,
12/15 = 12 × 8/15 × 8 = 96/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
3/40 = 3 × 3/40 × 3 = 9/120 - Subtract the two like fractions:
96/120 - 9/120 = 96 - 9/120 = 87/120 - After reducing the fraction, the answer is 29/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-3/40 12/15-6/40 12/30-3/40 12/15-3/80 36/15-3/40 12/15-9/40 12/45-3/40 60/15-3/40 12/15-15/40 12/75-3/40 84/15-3/40 12/15-21/40