Answers

Add 81/70 and 4/80

1^st number: 1 11/70, 2^nd number: 4/80

81/70 + 4/80 is 169/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 70 × 8 = 560,
   81/70 = 81 × 8/70 × 8 = 648/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   4/80 = 4 × 7/80 × 7 = 28/560
4. Add the two like fractions:
   648/560 + 28/560 = 648 + 28/560 = 676/560
5. 676/560 simplified gives 169/140
6. So, 81/70 + 4/80 = 169/140
   In mixed form: 129/140

MathStep (Works offline)

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

Related: ⁸¹/₇₀+⁸/₈₀ ⁸¹/₇₀+¹²/₈₀ ⁸¹/₇₀+²⁰/₈₀ ⁸¹/₇₀+²⁸/₈₀

Add Fractions Calculator