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:
[tex]Unit = 1\\ Rod = 1\\ Flat =1[/tex]
1 unit, 1 road and 1 flat means 3 blocks are used.
Using place value, the Mia's 3-digit number is:
[tex]Number = Flat \times 100 + Rod\times 10 + Unit \times 1[/tex]
Substitute values for Unit, Rod and Flat
[tex]Number = 1 \times 100 + 1\times 10 + 1 \times 1[/tex]
[tex]Number = 100 + 10 + 1[/tex]
[tex]Number = 111[/tex]
Hence, Mia's 3-digit number is 111.
Read more about base 10 blocks at:
https://brainly.com/question/933356