Add 21/10 and 15/70
1st number: 2 1/10, 2nd number: 15/70
21/10 + 15/70 is 81/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
15/70 = 15 × 1/70 × 1 = 15/70 - Add the two like fractions:
147/70 + 15/70 = 147 + 15/70 = 162/70 - 162/70 simplified gives 81/35
- So, 21/10 + 15/70 = 81/35
In mixed form: 211/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+15/70 21/10+30/70 21/20+15/70 63/10+15/70 21/10+45/70 21/30+15/70 21/10+75/70 21/50+15/70 21/70+15/70