Subtract 90/30 from 1/21
1st number: 1/21, 2nd number: 3 0/30
1/21 - 90/30 is -62/21.
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,
1/21 = 1 × 10/21 × 10 = 10/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
90/30 = 90 × 7/30 × 7 = 630/210 - Subtract the two like fractions:
10/210 - 630/210 = 10 - 630/210 = -620/210 - After reducing the fraction, the answer is -62/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-90/30 1/42-90/30 1/21-90/60 3/21-90/30 1/63-90/30 5/21-90/30 7/21-90/30