Count how many balloons there are. How many groups of 10? How many extra 1's?
1 group of ten, 0 extra ones! = 10
If I want to ADD 10, do I move up or down on the hundred chart?
DOWN! The numbers get bigger as you move down on the hundred chart.
If I want to SUBTRACT/TAKE AWAY 10, do I move up or down on the hundred chart?
UP! The numbers get smaller as you move up on the hundred chart.