It is not.
400 decimeters = 4,000 cm
4,000 cm = 40 m
When expanding number, we should separate the numbers according to the places like the number 275 written in expanded form 200+70+5. So, in this question we must likely done like this. The number is 39,005 the sum that is written on expanded form is 30,000+9,000+5.
21,618.........................
Can you show the full question?
