Subtract 18/9 from 1/21
1st number: 1/21, 2nd number: 2 0/9
1/21 - 18/9 is -41/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
1/21 = 1 × 3/21 × 3 = 3/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
18/9 = 18 × 7/9 × 7 = 126/63 - Subtract the two like fractions:
3/63 - 126/63 = 3 - 126/63 = -123/63 - After reducing the fraction, the answer is -41/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-18/9 1/21-36/9 1/42-18/9 3/21-18/9 1/21-54/9 1/63-18/9 1/21-18/27 5/21-18/9 1/21-90/9 1/21-18/45 7/21-18/9 1/21-18/63