Subtract 60/9 from 18/21
1st number: 18/21, 2nd number: 6 6/9
18/21 - 60/9 is -122/21.
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,
18/21 = 18 × 3/21 × 3 = 54/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
60/9 = 60 × 7/9 × 7 = 420/63 - Subtract the two like fractions:
54/63 - 420/63 = 54 - 420/63 = -366/63 - After reducing the fraction, the answer is -122/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-60/9 18/42-60/9 18/21-60/18 54/21-60/9 18/63-60/9 18/21-60/27 90/21-60/9 18/21-60/45 18/21-60/63