Subtract 4/3 from 90/70
1st number: 1 20/70, 2nd number: 1 1/3
90/70 - 4/3 is -1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 3 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 3 × 70 = 210,
4/3 = 4 × 70/3 × 70 = 280/210 - Subtract the two like fractions:
270/210 - 280/210 = 270 - 280/210 = -10/210 - After reducing the fraction, the answer is -1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-8/3 90/70-4/6 90/70-12/3 90/70-4/9 90/70-20/3 90/70-4/15 90/70-28/3 90/70-4/21