Subtract 18/21 from 12/5
1st number: 2 2/5, 2nd number: 18/21
12/5 - 18/21 is 54/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
12/5 = 12 × 21/5 × 21 = 252/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
18/21 = 18 × 5/21 × 5 = 90/105 - Subtract the two like fractions:
252/105 - 90/105 = 252 - 90/105 = 162/105 - After reducing the fraction, the answer is 54/35
- In mixed form: 119/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/5-18/21 12/5-36/21 12/10-18/21 12/5-18/42 36/5-18/21 12/5-54/21 12/15-18/21 12/5-18/63 60/5-18/21 12/5-90/21 12/25-18/21 84/5-18/21 12/35-18/21