Answers

Add 81/4 and 15/45

1^st number: 20 1/4, 2^nd number: 15/45

81/4 + 15/45 is 247/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 45 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 4 × 45 = 180,
   81/4 = 81 × 45/4 × 45 = 3645/180
3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
   15/45 = 15 × 4/45 × 4 = 60/180
4. Add the two like fractions:
   3645/180 + 60/180 = 3645 + 60/180 = 3705/180
5. 3705/180 simplified gives 247/12
6. So, 81/4 + 15/45 = 247/12
   In mixed form: 207/12

MathStep (Works offline)

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

Related: ⁸¹/₄+³⁰/₄₅ ⁸¹/₈+¹⁵/₄₅ ⁸¹/₄+¹⁵/₉₀ ⁸¹/₁₂+¹⁵/₄₅ ⁸¹/₄+⁷⁵/₄₅ ⁸¹/₂₀+¹⁵/₄₅ ⁸¹/₂₈+¹⁵/₄₅

Add Fractions Calculator