We will be working on using place value to +/- 1, +/- 10, +/- 100 for any number. We will be using place value discs to help model how the number changes when you change the different units. Students should understand that when +/-1 only the digit in the ones place is changing unless we have to trade up. Same with the digit in the tens place when +/- 10, and again only the digit in the hundreds place changes when +/- 100 unless we have to trade up.
Here are some videos to help you understand the approach we are using.