Subtract 72/10 from 5/21
1st number: 5/21, 2nd number: 7 2/10
5/21 - 72/10 is -731/105.
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,
5/21 = 5 × 10/21 × 10 = 50/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
72/10 = 72 × 21/10 × 21 = 1512/210 - Subtract the two like fractions:
50/210 - 1512/210 = 50 - 1512/210 = -1462/210 - After reducing the fraction, the answer is -731/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21-72/10 5/42-72/10 5/21-72/20 15/21-72/10 5/63-72/10 5/21-72/30 25/21-72/10 5/21-72/50 35/21-72/10 5/21-72/70