Add 21/15 and 40/18
1st number: 1 6/15, 2nd number: 2 4/18
21/15 + 40/18 is 163/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
21/15 = 21 × 6/15 × 6 = 126/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
40/18 = 40 × 5/18 × 5 = 200/90 - Add the two like fractions:
126/90 + 200/90 = 126 + 200/90 = 326/90 - 326/90 simplified gives 163/45
- So, 21/15 + 40/18 = 163/45
In mixed form: 328/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+40/18 21/15+80/18 21/30+40/18 21/15+40/36 63/15+40/18 21/45+40/18 21/15+40/54 21/75+40/18 21/15+40/90