Subtract 4/20 from 90/70
1st number: 1 20/70, 2nd number: 4/20
90/70 - 4/20 is 38/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
90/70 = 90 × 2/70 × 2 = 180/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
4/20 = 4 × 7/20 × 7 = 28/140 - Subtract the two like fractions:
180/140 - 28/140 = 180 - 28/140 = 152/140 - After reducing the fraction, the answer is 38/35
- In mixed form: 13/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-8/20 90/70-4/40 90/70-12/20 90/70-4/60 90/70-28/20