Subtract 21/10 from 70/18
1st number: 3 16/18, 2nd number: 2 1/10
70/18 - 21/10 is 161/90.
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,
70/18 = 70 × 5/18 × 5 = 350/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Subtract the two like fractions:
350/90 - 189/90 = 350 - 189/90 = 161/90 - In mixed form: 171/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/18-42/10 70/36-21/10 70/18-21/20 70/18-63/10 70/54-21/10 70/18-21/30 70/90-21/10 70/18-21/50 70/18-21/70