Answers

Add 21/63 and 21/18

1^st number: 21/63, 2^nd number: 1 3/18

21/63 + 21/18 is 3/2.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 18 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 63 × 2 = 126,
   21/63 = 21 × 2/63 × 2 = 42/126
3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
   21/18 = 21 × 7/18 × 7 = 147/126
4. Add the two like fractions:
   42/126 + 147/126 = 42 + 147/126 = 189/126
5. 189/126 simplified gives 3/2
6. So, 21/63 + 21/18 = 3/2
   In mixed form: 11/2

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