Subtract 18/5 from 12/40
1st number: 12/40, 2nd number: 3 3/5
12/40 - 18/5 is -33/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 5 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
12/40 = 12 × 1/40 × 1 = 12/40 - Likewise, for the 2nd fraction, since 5 × 8 = 40,
18/5 = 18 × 8/5 × 8 = 144/40 - Subtract the two like fractions:
12/40 - 144/40 = 12 - 144/40 = -132/40 - After reducing the fraction, the answer is -33/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/40-18/5 12/40-36/5 12/80-18/5 12/40-18/10 36/40-18/5 12/40-54/5 12/40-18/15 60/40-18/5 12/40-90/5 12/40-18/25 84/40-18/5 12/40-18/35