subtraction place value

I did a subtraction using place value. I subtracted numbers from the place values ones, tens, and hundreds.

To subtract 209-112, I did the following

First i spilt the hundred,tens and ones 112=(100+10+2)

Then i subtraction  201-2=199                                       

 Then 199-10=189

Finally i took 189-100=89

Then we answer are question of the scale with blocks. Each of the blocks hade numbers that will make it heaven we have the 1,5,10 and 20.