Answers

Add 36/21 and 42/54

1^st number: 1 15/21, 2^nd number: 42/54

36/21 + 42/54 is 157/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 21 × 18 = 378,
   36/21 = 36 × 18/21 × 18 = 648/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   42/54 = 42 × 7/54 × 7 = 294/378
4. Add the two like fractions:
   648/378 + 294/378 = 648 + 294/378 = 942/378
5. 942/378 simplified gives 157/63
6. So, 36/21 + 42/54 = 157/63
   In mixed form: 231/63

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