Answers

Add 81/63 and 21/7

1^st number: 1 18/63, 2^nd number: 3 0/7

81/63 + 21/7 is 30/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 7 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 63 × 1 = 63,
   81/63 = 81 × 1/63 × 1 = 81/63
3. Likewise, for the 2nd fraction, since 7 × 9 = 63,
   21/7 = 21 × 9/7 × 9 = 189/63
4. Add the two like fractions:
   81/63 + 189/63 = 81 + 189/63 = 270/63
5. 270/63 simplified gives 30/7
6. So, 81/63 + 21/7 = 30/7
   In mixed form: 42/7

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