Subtract 50/21 from 18/3
1st number: 6 0/3, 2nd number: 2 8/21
18/3 - 50/21 is 76/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
18/3 = 18 × 7/3 × 7 = 126/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
50/21 = 50 × 1/21 × 1 = 50/21 - Subtract the two like fractions:
126/21 - 50/21 = 126 - 50/21 = 76/21 - In mixed form: 313/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/3-50/21 18/6-50/21 18/3-50/42 54/3-50/21 18/9-50/21 18/3-50/63 90/3-50/21 18/15-50/21 18/21-50/21