Subtract 10/7 from 18/40
1st number: 18/40, 2nd number: 1 3/7
18/40 - 10/7 is -137/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
18/40 = 18 × 7/40 × 7 = 126/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
10/7 = 10 × 40/7 × 40 = 400/280 - Subtract the two like fractions:
126/280 - 400/280 = 126 - 400/280 = -274/280 - After reducing the fraction, the answer is -137/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/40-10/7 18/40-20/7 18/80-10/7 18/40-10/14 54/40-10/7 18/40-30/7 18/40-10/21 90/40-10/7 18/40-50/7 18/40-10/35 18/40-70/7 18/40-10/49