Add 21/30 and 40/15
1st number: 21/30, 2nd number: 2 10/15
21/30 + 40/15 is 101/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
21/30 = 21 × 1/30 × 1 = 21/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
40/15 = 40 × 2/15 × 2 = 80/30 - Add the two like fractions:
21/30 + 80/30 = 21 + 80/30 = 101/30 - So, 21/30 + 40/15 = 101/30
In mixed form: 311/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+40/15 21/30+80/15 21/60+40/15 21/30+40/30 63/30+40/15 21/90+40/15 21/30+40/45 21/30+40/75