Answers

Add 81/42 and 70/8

1^st number: 1 39/42, 2^nd number: 8 6/8

81/42 + 70/8 is 299/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 8 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 42 × 4 = 168,
   81/42 = 81 × 4/42 × 4 = 324/168
3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
   70/8 = 70 × 21/8 × 21 = 1470/168
4. Add the two like fractions:
   324/168 + 1470/168 = 324 + 1470/168 = 1794/168
5. 1794/168 simplified gives 299/28
6. So, 81/42 + 70/8 = 299/28
   In mixed form: 1019/28

MathStep (Works offline)

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

Related: ⁸¹/₈₄+⁷⁰/₈ ⁸¹/₄₂+⁷⁰/₁₆ ⁸¹/₄₂+⁷⁰/₂₄ ⁸¹/₄₂+⁷⁰/₄₀ ⁸¹/₄₂+⁷⁰/₅₆

Add Fractions Calculator