Answers

Add 63/42 and 9/90

1^st number: 1 21/42, 2^nd number: 9/90

63/42 + 9/90 is 8/5.

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,
   63/42 = 63 × 15/42 × 15 = 945/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   9/90 = 9 × 7/90 × 7 = 63/630
4. Add the two like fractions:
   945/630 + 63/630 = 945 + 63/630 = 1008/630
5. 1008/630 simplified gives 8/5
6. So, 63/42 + 9/90 = 8/5
   In mixed form: 13/5

MathStep (Works offline)

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

Related: ⁶³/₄₂+¹⁸/₉₀ ⁶³/₈₄+⁹/₉₀ ⁶³/₄₂+²⁷/₉₀ ⁶³/₄₂+⁴⁵/₉₀ ⁶³/₄₂+⁶³/₉₀

Add Fractions Calculator