Subtract 5/30 from 90/70
1st number: 1 20/70, 2nd number: 5/30
90/70 - 5/30 is 47/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
90/70 = 90 × 3/70 × 3 = 270/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
5/30 = 5 × 7/30 × 7 = 35/210 - Subtract the two like fractions:
270/210 - 35/210 = 270 - 35/210 = 235/210 - After reducing the fraction, the answer is 47/42
- In mixed form: 15/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-10/30 90/70-5/60 90/70-15/30 90/70-5/90 90/70-25/30 90/70-35/30