Answers

Add 72/42 and 28/40

1^st number: 1 30/42, 2^nd number: 28/40

72/42 + 28/40 is 169/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 42 × 20 = 840,
   72/42 = 72 × 20/42 × 20 = 1440/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   28/40 = 28 × 21/40 × 21 = 588/840
4. Add the two like fractions:
   1440/840 + 588/840 = 1440 + 588/840 = 2028/840
5. 2028/840 simplified gives 169/70
6. So, 72/42 + 28/40 = 169/70
   In mixed form: 229/70

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