Answers

Add 84/42 and 6/90

1^st number: 2 0/42, 2^nd number: 6/90

84/42 + 6/90 is 31/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 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 90 × 7 = 630,
   6/90 = 6 × 7/90 × 7 = 42/630
4. Add the two like fractions:
   1260/630 + 42/630 = 1260 + 42/630 = 1302/630
5. 1302/630 simplified gives 31/15
6. So, 84/42 + 6/90 = 31/15
   In mixed form: 21/15

MathStep (Works offline)

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

Related: ⁸⁴/₄₂+¹²/₉₀ ⁸⁴/₄₂+¹⁸/₉₀ ⁸⁴/₄₂+³⁰/₉₀ ⁸⁴/₄₂+⁴²/₉₀

Add Fractions Calculator