Add 15/70 and 21/5
1st number: 15/70, 2nd number: 4 1/5
15/70 + 21/5 is 309/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 5 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
15/70 = 15 × 1/70 × 1 = 15/70 - Likewise, for the 2nd fraction, since 5 × 14 = 70,
21/5 = 21 × 14/5 × 14 = 294/70 - Add the two like fractions:
15/70 + 294/70 = 15 + 294/70 = 309/70 - So, 15/70 + 21/5 = 309/70
In mixed form: 429/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70+21/5 15/70+42/5 15/70+21/10 45/70+21/5 15/70+63/5 15/70+21/15 75/70+21/5 15/70+21/25 15/70+21/35