Answers

Add 63/42 and 21/45

1^st number: 1 21/42, 2^nd number: 21/45

63/42 + 21/45 is 59/30.

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,
   63/42 = 63 × 15/42 × 15 = 945/630
3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
   21/45 = 21 × 14/45 × 14 = 294/630
4. Add the two like fractions:
   945/630 + 294/630 = 945 + 294/630 = 1239/630
5. 1239/630 simplified gives 59/30
6. So, 63/42 + 21/45 = 59/30
   In mixed form: 129/30

MathStep (Works offline)

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

Related: ⁶³/₄₂+⁴²/₄₅ ⁶³/₈₄+²¹/₄₅ ⁶³/₄₂+²¹/₉₀ ⁶³/₄₂+⁶³/₄₅

Add Fractions Calculator