Final answer:
Standard form of the given number is 352,086.
Step-by-step explanation:
The given number, 3 hundred thousands 5 ten thousands 2 thousands 8 tens 6 ones, can be written in standard form by adding the values of each place value:
Three hundred thousands = 300,000
Five ten thousands = 50,000
Two thousands = 2,000
Eight tens = 80
Six ones = 6
Adding these values together, we get the standard form of the given number as 352,086.