Counting up to

Practice

1. Which CGI word problem type is most closely associated with the counting up to strategy?

JCU

2. For what sorts of numbers is "counting up to" an efficient strategy?

Numbers where the minuend and the subtrahend are close (with a difference of 1, 2 or maybe 3)

3. Write a word problem for introducing "counting up to" as a strategy.

Your word problem should be a JCU with a change of 1 or 2.

4. Rewrite the missing number addition problem as a subtraction problem: 8 + ? = 11

11 - 8 = ?

5. Describe how to use "counting up to" to solve 7 - 5

5... 6 (put up a finger), 7 (put up another finger). Count the fingers up, the answer is 2.

6. Why do we want children to learn to use "counting up to" to solve subtraction problems?

They are efficient for a new set of subtraction problems (ones where the minuend and subtrahend are close).
Counting up is easier than counting back
It reinforces the relationship between addition and subtraction.

7. What would be a good problem type to compare counting back and counting up to?

PPW-PU (CDU would also be an acceptable answer).