Subtract 21/25 from 90/70
1st number: 1 20/70, 2nd number: 21/25
90/70 - 21/25 is 78/175.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 25 is 350
Next, find the equivalent fraction of both fractional numbers with denominator 350 - For the 1st fraction, since 70 × 5 = 350,
90/70 = 90 × 5/70 × 5 = 450/350 - Likewise, for the 2nd fraction, since 25 × 14 = 350,
21/25 = 21 × 14/25 × 14 = 294/350 - Subtract the two like fractions:
450/350 - 294/350 = 450 - 294/350 = 156/350 - After reducing the fraction, the answer is 78/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-42/25 90/70-21/50 90/70-63/25 90/70-21/75