Use a number line and a model of a hot air balloon. Model each problem and answer the questions that follow; the first one gives you hints as to the types of answers you should give.
3 + (-6)
Where does the balloon start? (#)________
Do you add or subtract something from the balloon? (operation)__+____
What do you add or subtract from the balloon? (# bags of?) ________________
Where does the balloon end up? (#)__-3___