We are given the number four-hundred thirty two, which means we have three possible place values.
4 3 2
(where H is hundreds, T is tens, and O is ones)
H T O
We see that the 3 is in the tens place, so we take that number and fill in every place after it with zero's. This means that we will replace the 2 with a 0, giving us a unit value of 30.
:)