Subtract 21/30 from 90/70
1st number: 1 20/70, 2nd number: 21/30
90/70 - 21/30 is 41/70.
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,
21/30 = 21 × 7/30 × 7 = 147/210 - Subtract the two like fractions:
270/210 - 147/210 = 270 - 147/210 = 123/210 - After reducing the fraction, the answer is 41/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-42/30 90/70-21/60 90/70-63/30 90/70-21/90