Subtract 4/30 from 15/40
15/40 - 4/30 is 29/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
15/40 = 15 × 3/40 × 3 = 45/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
4/30 = 4 × 4/30 × 4 = 16/120 - Subtract the two like fractions:
45/120 - 16/120 = 45 - 16/120 = 29/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40-4/30 15/40-8/30 15/80-4/30 15/40-4/60 45/40-4/30 15/40-12/30 15/40-4/90 75/40-4/30 15/40-20/30 15/40-28/30