Answers

Add 42/54 and 63/21

1^st number: 42/54, 2^nd number: 3 0/21

42/54 + 63/21 is 34/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 21 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   42/54 = 42 × 7/54 × 7 = 294/378
3. Likewise, for the 2nd fraction, since 21 × 18 = 378,
   63/21 = 63 × 18/21 × 18 = 1134/378
4. Add the two like fractions:
   294/378 + 1134/378 = 294 + 1134/378 = 1428/378
5. 1428/378 simplified gives 34/9
6. So, 42/54 + 63/21 = 34/9
   In mixed form: 37/9

MathStep (Works offline)

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

Related: ⁸⁴/₅₄+⁶³/₂₁ ⁴²/₅₄+⁶³/₄₂

Add Fractions Calculator