Subtract 30/21 from 14/18
1st number: 14/18, 2nd number: 1 9/21
14/18 - 30/21 is -41/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
14/18 = 14 × 7/18 × 7 = 98/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
30/21 = 30 × 6/21 × 6 = 180/126 - Subtract the two like fractions:
98/126 - 180/126 = 98 - 180/126 = -82/126 - After reducing the fraction, the answer is -41/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/18-30/21 14/18-60/21 14/36-30/21 14/18-30/42 42/18-30/21 14/18-90/21 14/54-30/21 14/18-30/63 70/18-30/21 14/90-30/21 98/18-30/21