Mia used 3 different base 10 blocks to model a 3 digit number what is the number?

Base 10 block is a model for representing numbers. Mia's 3-digit number is 111.

There are 4 types of base 10 blocks (see attachment)

Because Mia's number is three digits, then the blocks used are: Units, Rod and Flat.

Each of the 10 blocks are used, means the number of blocks used in each is:

1 unit, 1 road and 1 flat means 3 blocks are used.

Using place value, the Mia's 3-digit number is:

Substitute values for Unit, Rod and Flat

Hence, Mia's 3-digit number is 111.

Read more about base 10 blocks at:

link

126 maybe. sorry