Add 21/15 and 20/24
1st number: 1 6/15, 2nd number: 20/24
21/15 + 20/24 is 67/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
21/15 = 21 × 8/15 × 8 = 168/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
20/24 = 20 × 5/24 × 5 = 100/120 - Add the two like fractions:
168/120 + 100/120 = 168 + 100/120 = 268/120 - 268/120 simplified gives 67/30
- So, 21/15 + 20/24 = 67/30
In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+20/24 21/15+40/24 21/30+20/24 21/15+20/48 63/15+20/24 21/15+60/24 21/45+20/24 21/15+20/72 21/75+20/24