Subtract 45/30 from 7/40
1st number: 7/40, 2nd number: 1 15/30
7/40 - 45/30 is -53/40.
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,
7/40 = 7 × 3/40 × 3 = 21/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
45/30 = 45 × 4/30 × 4 = 180/120 - Subtract the two like fractions:
21/120 - 180/120 = 21 - 180/120 = -159/120 - After reducing the fraction, the answer is -53/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-45/30 7/40-90/30 7/80-45/30 7/40-45/60 21/40-45/30 7/40-45/90 35/40-45/30 49/40-45/30