Answer:
No Maria is not correct.
Explanation:
Given : Maria said the 4 in 400,000 has a value of 400.
To find : Is maria correct? Explain.
Solution :
The place value system is
Hundred Th. Ten Th. Thousand Hundred Tens Ones
4 0 0 0 0 0
The value of 4 in 400,000

i.e. The value of 4 in 400,000 is 4 hundred thousand not 4 hundred.
Therefore, No Maria is not correct.