Subtract 30/8 from 40/15
1st number: 2 10/15, 2nd number: 3 6/8
40/15 - 30/8 is -13/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
40/15 = 40 × 8/15 × 8 = 320/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
30/8 = 30 × 15/8 × 15 = 450/120 - Subtract the two like fractions:
320/120 - 450/120 = 320 - 450/120 = -130/120 - After reducing the fraction, the answer is -13/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/15-30/8 40/15-60/8 40/30-30/8 40/15-30/16 40/15-90/8 40/45-30/8 40/15-30/24 40/75-30/8 40/15-30/40 40/15-30/56