Answers

Add 63/42 and 21/54

1^st number: 1 21/42, 2^nd number: 21/54

63/42 + 21/54 is 17/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 42 × 9 = 378,
   63/42 = 63 × 9/42 × 9 = 567/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   21/54 = 21 × 7/54 × 7 = 147/378
4. Add the two like fractions:
   567/378 + 147/378 = 567 + 147/378 = 714/378
5. 714/378 simplified gives 17/9
6. So, 63/42 + 21/54 = 17/9
   In mixed form: 18/9

MathStep (Works offline)

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

Related: ⁶³/₄₂+⁴²/₅₄ ⁶³/₈₄+²¹/₅₄ ⁶³/₄₂+⁶³/₅₄

Add Fractions Calculator