Answers

Add 84/80 and 12/60

1^st number: 1 4/80, 2^nd number: 12/60

84/80 + 12/60 is 5/4.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 60 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 80 × 3 = 240,
   84/80 = 84 × 3/80 × 3 = 252/240
3. Likewise, for the 2nd fraction, since 60 × 4 = 240,
   12/60 = 12 × 4/60 × 4 = 48/240
4. Add the two like fractions:
   252/240 + 48/240 = 252 + 48/240 = 300/240
5. 300/240 simplified gives 5/4
6. So, 84/80 + 12/60 = 5/4
   In mixed form: 11/4

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