Subtract 12/18 from 72/21
1st number: 3 9/21, 2nd number: 12/18
72/21 - 12/18 is 58/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
72/21 = 72 × 6/21 × 6 = 432/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
12/18 = 12 × 7/18 × 7 = 84/126 - Subtract the two like fractions:
432/126 - 84/126 = 432 - 84/126 = 348/126 - After reducing the fraction, the answer is 58/21
- In mixed form: 216/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21-24/18 72/42-12/18 72/21-12/36 72/21-36/18 72/63-12/18 72/21-12/54 72/21-60/18 72/21-12/90 72/21-84/18