Add 21/18 and 70/36
1st number: 1 3/18, 2nd number: 1 34/36
21/18 + 70/36 is 28/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
21/18 = 21 × 2/18 × 2 = 42/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
70/36 = 70 × 1/36 × 1 = 70/36 - Add the two like fractions:
42/36 + 70/36 = 42 + 70/36 = 112/36 - 112/36 simplified gives 28/9
- So, 21/18 + 70/36 = 28/9
In mixed form: 31/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+70/36 21/36+70/36 21/18+70/72 63/18+70/36 21/54+70/36 21/90+70/36