Answers

Add 28/40 and 54/42

1^st number: 28/40, 2^nd number: 1 12/42

28/40 + 54/42 is 139/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 42 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   28/40 = 28 × 21/40 × 21 = 588/840
3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
   54/42 = 54 × 20/42 × 20 = 1080/840
4. Add the two like fractions:
   588/840 + 1080/840 = 588 + 1080/840 = 1668/840
5. 1668/840 simplified gives 139/70
6. So, 28/40 + 54/42 = 139/70
   In mixed form: 169/70

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