Answers

Add 84/12 and 28/40

1^st number: 7 0/12, 2^nd number: 28/40

84/12 + 28/40 is 77/10.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 40 is 120
   
   Next, find the equivalent fraction of both fractional numbers with denominator 120
2. For the 1st fraction, since 12 × 10 = 120,
   84/12 = 84 × 10/12 × 10 = 840/120
3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
   28/40 = 28 × 3/40 × 3 = 84/120
4. Add the two like fractions:
   840/120 + 84/120 = 840 + 84/120 = 924/120
5. 924/120 simplified gives 77/10
6. So, 84/12 + 28/40 = 77/10
   In mixed form: 77/10

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