Subtract 12/10 from 72/21
1st number: 3 9/21, 2nd number: 1 2/10
72/21 - 12/10 is 78/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
72/21 = 72 × 10/21 × 10 = 720/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
12/10 = 12 × 21/10 × 21 = 252/210 - Subtract the two like fractions:
720/210 - 252/210 = 720 - 252/210 = 468/210 - After reducing the fraction, the answer is 78/35
- In mixed form: 28/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21-24/10 72/42-12/10 72/21-12/20 72/21-36/10 72/63-12/10 72/21-12/30 72/21-60/10 72/21-12/50 72/21-84/10 72/21-12/70