Subtract 18/40 from 3/10
3/10 - 18/40 is -3/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
3/10 = 3 × 4/10 × 4 = 12/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
18/40 = 18 × 1/40 × 1 = 18/40 - Subtract the two like fractions:
12/40 - 18/40 = 12 - 18/40 = -6/40 - After reducing the fraction, the answer is -3/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10-18/40 3/10-36/40 3/20-18/40 3/10-18/80 9/10-18/40 3/10-54/40 3/30-18/40 15/10-18/40 3/10-90/40 3/50-18/40 21/10-18/40 3/70-18/40