Add 21/10 and 81/70
1st number: 2 1/10, 2nd number: 1 11/70
21/10 + 81/70 is 114/35.
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,
81/70 = 81 × 1/70 × 1 = 81/70 - Add the two like fractions:
147/70 + 81/70 = 147 + 81/70 = 228/70 - 228/70 simplified gives 114/35
- So, 21/10 + 81/70 = 114/35
In mixed form: 39/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+81/70 21/20+81/70 63/10+81/70 21/30+81/70 21/50+81/70 21/70+81/70