1. AUGUST 7TH , 2013
Learning outcome: How can you tell
whether an argument provides a
correct proof of a claim?

2. What conjecture can you make based on the
following set of problems?
5 + 7 =
3 + 11 =
9 + 15 =
17 + 23 =
Conjecture:
WARM-UP

3. IF A AND B ARE ODD NUMBERS, THEN A + B (THE
SUM) IS AN EVEN NUMBER.
Visual Model Numerical/Symbolic
Verbal Everyday Life

4. p. 6 #3 Reasoning about numbers
CLASSWORK

5. • Does the argument have any errors?
• Does it show the statement is true for all
numbers or for some numbers?
• Does the argument show why the
statement is true?
• Does the argument provide an easy way to
convince a skeptic?
SUMMARY –TOOL KIT

6. Check your understanding p. 9
EXIT SLIP

7. SUMMARY
As students present their interactions . . .
 Critic their interactions for productiveness.
 Compare their interactions to the
interactions in your group.
 Be ready to share your thoughts with the
class.

8. EXIT ITEM