Answers

Add 1/18 and 40/21

1^st number: 1/18, 2^nd number: 1 19/21

1/18 + 40/21 is 247/126.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 21 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   1/18 = 1 × 7/18 × 7 = 7/126
3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
   40/21 = 40 × 6/21 × 6 = 240/126
4. Add the two like fractions:
   7/126 + 240/126 = 7 + 240/126 = 247/126
5. So, 1/18 + 40/21 = 247/126
   In mixed form: 1121/126

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