Add 21/15 and 70/18
1st number: 1 6/15, 2nd number: 3 16/18
21/15 + 70/18 is 238/45.
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,
70/18 = 70 × 5/18 × 5 = 350/90 - Add the two like fractions:
126/90 + 350/90 = 126 + 350/90 = 476/90 - 476/90 simplified gives 238/45
- So, 21/15 + 70/18 = 238/45
In mixed form: 513/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+70/18 21/30+70/18 21/15+70/36 63/15+70/18 21/45+70/18 21/15+70/54 21/75+70/18 21/15+70/90