Marie used base-ten blocks to model 328 she used 3 hundreds, 2 tens, and 8 ones. for what could you trade one of the tens?

10 ones?

To determine what could be traded for one of the tens in the number 328, we need to consider the value of the base-ten blocks.

In the base-ten number system, each place value represents a power of ten. The three-digit number 328 can be broken down into its place values as follows:

- 3 hundreds (3 x 100)
- 2 tens (2 x 10)
- 8 ones (8 x 1)

In this case, the tens place represents a value of 10. Therefore, trading one of the tens means exchanging it for an equivalent value in ones.

To do this, we can trade one of the tens for ten ones, because 10 ones have the same value as a single ten.

So, to answer the question, you could trade one of the tens for ten ones.