Subtract 3/50 from 90/70
1st number: 1 20/70, 2nd number: 3/50
90/70 - 3/50 is 429/350.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 50 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 50 × 7 = 350,
3/50 = 3 × 7/50 × 7 = 21/350 - Subtract the two like fractions:
450/350 - 21/350 = 450 - 21/350 = 429/350 - In mixed form: 179/350
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-6/50 90/70-9/50 90/70-15/50 90/70-21/50