Add 28/18 and 24/21
1st number: 1 10/18, 2nd number: 1 3/21
28/18 + 24/21 is 170/63.
Steps for adding 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,
24/21 = 24 × 6/21 × 6 = 144/126 - Add the two like fractions:
196/126 + 144/126 = 196 + 144/126 = 340/126 - 340/126 simplified gives 170/63
- So, 28/18 + 24/21 = 170/63
In mixed form: 244/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18+24/21 28/18+48/21 28/36+24/21 28/18+24/42 84/18+24/21 28/18+72/21 28/54+24/21 28/18+24/63 28/90+24/21