Subtract 15/40 from 45/30
1st number: 1 15/30, 2nd number: 15/40
45/30 - 15/40 is 9/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
45/30 = 45 × 4/30 × 4 = 180/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
15/40 = 15 × 3/40 × 3 = 45/120 - Subtract the two like fractions:
180/120 - 45/120 = 180 - 45/120 = 135/120 - After reducing the fraction, the answer is 9/8
- In mixed form: 11/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30-15/40 45/30-30/40 45/60-15/40 45/30-15/80 45/30-45/40 45/90-15/40 45/30-75/40