Subtract 40/18 from 1/21
1st number: 1/21, 2nd number: 2 4/18
1/21 - 40/18 is -137/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
1/21 = 1 × 6/21 × 6 = 6/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
40/18 = 40 × 7/18 × 7 = 280/126 - Subtract the two like fractions:
6/126 - 280/126 = 6 - 280/126 = -274/126 - After reducing the fraction, the answer is -137/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-40/18 1/21-80/18 1/42-40/18 1/21-40/36 3/21-40/18 1/63-40/18 1/21-40/54 5/21-40/18 1/21-40/90 7/21-40/18