Add 21/36 and 15/8
1st number: 21/36, 2nd number: 1 7/8
21/36 + 15/8 is 59/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 36 × 2 = 72,
21/36 = 21 × 2/36 × 2 = 42/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
15/8 = 15 × 9/8 × 9 = 135/72 - Add the two like fractions:
42/72 + 135/72 = 42 + 135/72 = 177/72 - 177/72 simplified gives 59/24
- So, 21/36 + 15/8 = 59/24
In mixed form: 211/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36+15/8 21/36+30/8 21/72+15/8 21/36+15/16 63/36+15/8 21/36+45/8 21/36+15/24 21/36+75/8 21/36+15/40 21/36+15/56