What is the standard form for 200,000+80,000,+700+6?

280,706

Explanation:
The expression
200,000 + 80,000 + 700 + 6
may be expressed as
200 thousand, plus
   80 thousand, plus
700 hundred, plus
    6  ones

Because hundreds include ones, therefore
700 + 6 = 706
Commas are used to separate hundreds from thousands in the standard form.

200 thousand  + 80 thousand = 280 thousand = 280,000

Therefore,
200,000  80,000 + 700 + 6
= 280,000 + 706
= 280,706

The diagram shown below explains how the different categories add up.