Answers

Add 81/15 and 5/21

1^st number: 5 6/15, 2^nd number: 5/21

81/15 + 5/21 is 592/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 21 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 15 × 7 = 105,
   81/15 = 81 × 7/15 × 7 = 567/105
3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
   5/21 = 5 × 5/21 × 5 = 25/105
4. Add the two like fractions:
   567/105 + 25/105 = 567 + 25/105 = 592/105
5. So, 81/15 + 5/21 = 592/105
   In mixed form: 567/105

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