Add 24/54 and 28/21
1st number: 24/54, 2nd number: 1 7/21
24/54 + 28/21 is 16/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
24/54 = 24 × 7/54 × 7 = 168/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
28/21 = 28 × 18/21 × 18 = 504/378 - Add the two like fractions:
168/378 + 504/378 = 168 + 504/378 = 672/378 - 672/378 simplified gives 16/9
- So, 24/54 + 28/21 = 16/9
In mixed form: 17/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/54+28/21 24/54+56/21 24/54+28/42 72/54+28/21 24/54+84/21 24/54+28/63