Reading and writing whole numbers can be explained by using the following illustration.
Take a close look and carefully study it!
Recall that the place value for 2, 4, and 6 are the hundred-thousands,the ten-thousands,and the thousands respectively.
Again, the position occupied by 2 is the hundred-thousands and putting a 2 is this position means that there are 2 hundred-thousands or two hundred thousand.
In the same way, putting a 4 in the ten-thousands position means that there are 4 ten-thousands or forty thousand because 4 tens is forty.
Finally, putting a 6 in the thousands position means that there are 6 thousands or six thousand.