Answers

Add 84/42 and 15/45

1^st number: 2 0/42, 2^nd number: 15/45

84/42 + 15/45 is 7/3.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 45 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   84/42 = 84 × 15/42 × 15 = 1260/630
3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
   15/45 = 15 × 14/45 × 14 = 210/630
4. Add the two like fractions:
   1260/630 + 210/630 = 1260 + 210/630 = 1470/630
5. 1470/630 simplified gives 7/3
6. So, 84/42 + 15/45 = 7/3
   In mixed form: 21/3

MathStep (Works offline)

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

Related: ⁸⁴/₄₂+³⁰/₄₅ ⁸⁴/₄₂+¹⁵/₉₀ ⁸⁴/₄₂+⁷⁵/₄₅

Add Fractions Calculator