Subtract 70/36 from 21/20
1st number: 1 1/20, 2nd number: 1 34/36
21/20 - 70/36 is -161/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
21/20 = 21 × 9/20 × 9 = 189/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
70/36 = 70 × 5/36 × 5 = 350/180 - Subtract the two like fractions:
189/180 - 350/180 = 189 - 350/180 = -161/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-70/36 21/40-70/36 21/20-70/72 63/20-70/36 21/60-70/36