Subtract 18/20 from 21/3
1st number: 7 0/3, 2nd number: 18/20
21/3 - 18/20 is 61/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 3 × 20 = 60,
21/3 = 21 × 20/3 × 20 = 420/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
18/20 = 18 × 3/20 × 3 = 54/60 - Subtract the two like fractions:
420/60 - 54/60 = 420 - 54/60 = 366/60 - After reducing the fraction, the answer is 61/10
- In mixed form: 61/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-18/20 21/3-36/20 21/6-18/20 21/3-18/40 63/3-18/20 21/3-54/20 21/9-18/20 21/3-18/60 21/3-90/20 21/15-18/20