Answers

Add 81/90 and 81/12

1^st number: 81/90, 2^nd number: 6 9/12

81/90 + 81/12 is 153/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 12 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 90 × 2 = 180,
   81/90 = 81 × 2/90 × 2 = 162/180
3. Likewise, for the 2nd fraction, since 12 × 15 = 180,
   81/12 = 81 × 15/12 × 15 = 1215/180
4. Add the two like fractions:
   162/180 + 1215/180 = 162 + 1215/180 = 1377/180
5. 1377/180 simplified gives 153/20
6. So, 81/90 + 81/12 = 153/20
   In mixed form: 713/20

MathStep (Works offline)

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

Related: ⁸¹/₉₀+⁸¹/₂₄ ⁸¹/₉₀+⁸¹/₃₆ ⁸¹/₉₀+⁸¹/₆₀ ⁸¹/₉₀+⁸¹/₈₄

Add Fractions Calculator