Answers

Add 81/72 and 8/21

1^st number: 1 9/72, 2^nd number: 8/21

81/72 + 8/21 is 253/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 21 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 72 × 7 = 504,
   81/72 = 81 × 7/72 × 7 = 567/504
3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
   8/21 = 8 × 24/21 × 24 = 192/504
4. Add the two like fractions:
   567/504 + 192/504 = 567 + 192/504 = 759/504
5. 759/504 simplified gives 253/168
6. So, 81/72 + 8/21 = 253/168
   In mixed form: 185/168

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