Subtract 25/20 from 90/70
1st number: 1 20/70, 2nd number: 1 5/20
90/70 - 25/20 is 1/28.
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,
25/20 = 25 × 7/20 × 7 = 175/140 - Subtract the two like fractions:
180/140 - 175/140 = 180 - 175/140 = 5/140 - After reducing the fraction, the answer is 1/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-50/20 90/70-25/40 90/70-75/20 90/70-25/60