Subtract 3/30 from 90/21
1st number: 4 6/21, 2nd number: 3/30
90/21 - 3/30 is 293/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
90/21 = 90 × 10/21 × 10 = 900/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
3/30 = 3 × 7/30 × 7 = 21/210 - Subtract the two like fractions:
900/210 - 21/210 = 900 - 21/210 = 879/210 - After reducing the fraction, the answer is 293/70
- In mixed form: 413/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-6/30 90/42-3/30 90/21-3/60 90/21-9/30 90/63-3/30 90/21-3/90 90/21-15/30 90/21-21/30