Answers

Add 20/84 and 36/45

20/84 + 36/45 is 109/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 45 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 84 × 15 = 1260,
   20/84 = 20 × 15/84 × 15 = 300/1260
3. Likewise, for the 2nd fraction, since 45 × 28 = 1260,
   36/45 = 36 × 28/45 × 28 = 1008/1260
4. Add the two like fractions:
   300/1260 + 1008/1260 = 300 + 1008/1260 = 1308/1260
5. 1308/1260 simplified gives 109/105
6. So, 20/84 + 36/45 = 109/105
   In mixed form: 14/105

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