Subtract 98/90 from 9/21
1st number: 9/21, 2nd number: 1 8/90
9/21 - 98/90 is -208/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
9/21 = 9 × 30/21 × 30 = 270/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
98/90 = 98 × 7/90 × 7 = 686/630 - Subtract the two like fractions:
270/630 - 686/630 = 270 - 686/630 = -416/630 - After reducing the fraction, the answer is -208/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-98/90 9/42-98/90 27/21-98/90 9/63-98/90 45/21-98/90 63/21-98/90