Question

Explain how to use the combine place vales strategy to fine 223- 119

Answer 1

So, the subtraction looks like this: 

   223
  -119
_______

The reason why combining place values here is necessary is that 3 is less than 9 (so I can't just substract in the one's place without going to negative numbers)

so we combine the ones and tens places and substract the whole: 23-19 is four!
   223
  -119
_______
     04

and then we continue
   223
  -119
_______
    204

and that's the result!