Display the Addition Strategies Menu in the Student Activity Book Reference section. See Figure 2.
- Do you have questions about any of the addition
strategies on this menu?
- Imagine you were ordering snacks at a snack shop
and you wanted to make sure you had enough
money. Which strategy could help you decide what
to order? (Possible response: I would use mental
math to estimate the total cost of my items to
make sure I had enough money. I might use
friendly numbers.)
- Are some of these strategies more appropriate or
efficient than others for this problem? Why? (Possible response: I would not be carrying a 200
Chart or base-ten pieces to a snack shop, so mental
math would be a better way to estimate the total.)
- How did you use subtraction to find the change
due? (I started with the money there was in the
beginning and took all the money spent away.
The change is what is left.)
- Can you think of a rule about how much change
you should receive? (The amount of money you
give to the seller minus the amount of money
spent equals the change you should get back.)
- In this unit, you used addition to check your subtraction.
What could you do to make sure you got
the right amount of change? (Add the change you
get to the amount you spent and it should be the
amount of money you gave to the seller.)
Display the Subtraction Strategies Menu in the Student Activity Book Reference section. See Figure 3.
- Do you have questions about any of the subtraction strategies on this menu?
- In this unit, we have talked about many ways to solve subtraction problems. What are your two favorite ways and why?
