Subtract 9/40 from 5/30
5/30 - 9/40 is -7/120.
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,
5/30 = 5 × 4/30 × 4 = 20/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
9/40 = 9 × 3/40 × 3 = 27/120 - Subtract the two like fractions:
20/120 - 27/120 = 20 - 27/120 = -7/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/30-9/40 5/30-18/40 5/60-9/40 5/30-9/80 15/30-9/40 5/30-27/40 5/90-9/40 25/30-9/40 5/30-45/40 35/30-9/40 5/30-63/40