Answers

Add 30/21 and 81/56

1^st number: 1 9/21, 2^nd number: 1 25/56

30/21 + 81/56 is 23/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 56 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 21 × 8 = 168,
   30/21 = 30 × 8/21 × 8 = 240/168
3. Likewise, for the 2nd fraction, since 56 × 3 = 168,
   81/56 = 81 × 3/56 × 3 = 243/168
4. Add the two like fractions:
   240/168 + 243/168 = 240 + 243/168 = 483/168
5. 483/168 simplified gives 23/8
6. So, 30/21 + 81/56 = 23/8
   In mixed form: 27/8

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