Subtract 21/3 from 90/18
1st number: 5 0/18, 2nd number: 7 0/3
90/18 - 21/3 is -2/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 3 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 18 × 1 = 18,
90/18 = 90 × 1/18 × 1 = 90/18 - Likewise, for the 2nd fraction, since 3 × 6 = 18,
21/3 = 21 × 6/3 × 6 = 126/18 - Subtract the two like fractions:
90/18 - 126/18 = 90 - 126/18 = -36/18 - After reducing the fraction, the answer is -2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18-42/3 90/36-21/3 90/18-21/6 90/18-63/3 90/54-21/3 90/18-21/9 90/18-21/15