Subtract 4/21 from 28/18
1st number: 1 10/18, 2nd number: 4/21
28/18 - 4/21 is 86/63.
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,
28/18 = 28 × 7/18 × 7 = 196/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
4/21 = 4 × 6/21 × 6 = 24/126 - Subtract the two like fractions:
196/126 - 24/126 = 196 - 24/126 = 172/126 - After reducing the fraction, the answer is 86/63
- In mixed form: 123/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18-4/21 28/18-8/21 28/36-4/21 28/18-4/42 84/18-4/21 28/18-12/21 28/54-4/21 28/18-4/63 28/18-20/21 28/90-4/21 28/18-28/21