Creat a number that is less than 3 hundred thousands, 7 ten-thousands, 5 thousands, 2 hundreds, 1 ten.

Ok to create a number less than 3 hundred thousand, 7 ten-thousands, 5 thousands, 2 hundreds and 1 ten, we need to know the place values of large numbers.
If it is less than 3 hundred thousand:
There would be 6 decimal places or: > 300,000

7 ten thousands:
70,000

5 thousand:
5,000

1 ten:
10

Join together all these numbers to get something like:
275,010

~I hope this helps!~