Answers

Add 25/21 and 70/80

1^st number: 1 4/21, 2^nd number: 70/80

25/21 + 70/80 is 347/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   25/21 = 25 × 80/21 × 80 = 2000/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   70/80 = 70 × 21/80 × 21 = 1470/1680
4. Add the two like fractions:
   2000/1680 + 1470/1680 = 2000 + 1470/1680 = 3470/1680
5. 3470/1680 simplified gives 347/168
6. So, 25/21 + 70/80 = 347/168
   In mixed form: 211/168

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁵⁰/₂₁+⁷⁰/₈₀ ²⁵/₄₂+⁷⁰/₈₀ ⁷⁵/₂₁+⁷⁰/₈₀ ²⁵/₆₃+⁷⁰/₈₀

Add Fractions Calculator