Subtract 70/90 from 30/20
1st number: 1 10/20, 2nd number: 70/90
30/20 - 70/90 is 13/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
30/20 = 30 × 9/20 × 9 = 270/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Subtract the two like fractions:
270/180 - 140/180 = 270 - 140/180 = 130/180 - After reducing the fraction, the answer is 13/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20-70/90 30/40-70/90 90/20-70/90 30/60-70/90