Answers

Add 20/63 and 42/54

20/63 + 42/54 is 23/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 63 × 6 = 378,
   20/63 = 20 × 6/63 × 6 = 120/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   42/54 = 42 × 7/54 × 7 = 294/378
4. Add the two like fractions:
   120/378 + 294/378 = 120 + 294/378 = 414/378
5. 414/378 simplified gives 23/21
6. So, 20/63 + 42/54 = 23/21
   In mixed form: 12/21

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