Subtract 21/10 from 72/18
1st number: 4 0/18, 2nd number: 2 1/10
72/18 - 21/10 is 19/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
72/18 = 72 × 5/18 × 5 = 360/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Subtract the two like fractions:
360/90 - 189/90 = 360 - 189/90 = 171/90 - After reducing the fraction, the answer is 19/10
- In mixed form: 19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18-42/10 72/36-21/10 72/18-21/20 72/18-63/10 72/54-21/10 72/18-21/30 72/90-21/10 72/18-21/50 72/18-21/70