Answers

Add 81/42 and 72/5

1^st number: 1 39/42, 2^nd number: 14 2/5

81/42 + 72/5 is 1143/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 5 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 42 × 5 = 210,
   81/42 = 81 × 5/42 × 5 = 405/210
3. Likewise, for the 2nd fraction, since 5 × 42 = 210,
   72/5 = 72 × 42/5 × 42 = 3024/210
4. Add the two like fractions:
   405/210 + 3024/210 = 405 + 3024/210 = 3429/210
5. 3429/210 simplified gives 1143/70
6. So, 81/42 + 72/5 = 1143/70
   In mixed form: 1623/70

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