Answers

Add 20/12 and 84/45

1^st number: 1 8/12, 2^nd number: 1 39/45

20/12 + 84/45 is 53/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 45 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 12 × 15 = 180,
   20/12 = 20 × 15/12 × 15 = 300/180
3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
   84/45 = 84 × 4/45 × 4 = 336/180
4. Add the two like fractions:
   300/180 + 336/180 = 300 + 336/180 = 636/180
5. 636/180 simplified gives 53/15
6. So, 20/12 + 84/45 = 53/15
   In mixed form: 38/15

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