Add 21/18 and 15/70
1st number: 1 3/18, 2nd number: 15/70
21/18 + 15/70 is 29/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
21/18 = 21 × 35/18 × 35 = 735/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
15/70 = 15 × 9/70 × 9 = 135/630 - Add the two like fractions:
735/630 + 135/630 = 735 + 135/630 = 870/630 - 870/630 simplified gives 29/21
- So, 21/18 + 15/70 = 29/21
In mixed form: 18/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+15/70 21/18+30/70 21/36+15/70 63/18+15/70 21/18+45/70 21/54+15/70 21/18+75/70 21/90+15/70