Discuss strategies for solving the addition facts in
Groups A–B by writing the following facts on the
board.
1 + 1, 2 + 1, 3 + 2, 4 + 2, 2 + 2, 4 + 1, 5 + 3, 4 + 0
This is a sample of the facts in Groups A and B. Ask
students to choose a fact and tell their partner how they
would solve it. Once they have finished, ask them to
repeat this process with another fact.
After students
have had a few minutes to discuss these strategies, ask
a student to explain how he or she solved 4 + 2.
- Show or tell how to solve 4 + 2. (Possible response:
I thought about a number line and counted on from
4; I counted on from 4 in my head.)
- What other facts did you solve the same way?
(Possible response: 5 + 3, 2 + 2, 2 + 1)
- What should this strategy be called? (Possible
responses: Jill's strategy; counting on)
- What other facts on these charts might you solve by
counting on?
- What tools can help us count on? (Possible
responses: a number line, counters, a ten frame)
- When you count on, how do you decide which number
to put in your head? (Possible responses: I
always start with the larger number and then count
on the smaller number.)
Find these facts on the cards on the Counting
Strategies and Reasoning Strategies charts from
Lesson 3. Move the cards showing these facts together
on the chart and label the group of facts "Counting
On."
- What is 32 + 2? (34)
- What is 53 + 1? (54)
- What strategy did you use? (Possible response:
Counting on again. The numbers are just larger.)
Discuss Strategies for Facts with Zero. Discuss
strategies for thinking about solving facts with zero.
- How did you solve 4 + 0? (Possible responses: I
thought of a story. I have 4 flowers and did not add
anymore so I still have 4 flowers.)
- Look at the cards with zeros. What happens when
you add zero to a number? (Zero plus any number
is that number.)
- What is 32 + 0? (32) 53 + 0? (53) 206 + 0? (206)
- Write an addition story for 0 + 3. (Possible
response: I had 0 pieces of candy. My mom gave
me 3 pieces. Then I had three pieces of candy.
0 + 3 = 3)
- Write a different addition story for 0 + 3. (Possible
response: I had 3 pieces of candy and asked for
more. Mom said I had enough and gave me 0
more. I still had only 3 pieces of candy. 3 + 0 = 3)
- Write a subtraction story for 3, 0, and 3. Tell a number
sentence to match your story. (Possible
response: I had 3 pieces of candy and didn't share
any. I still had 3 pieces of candy. 3 − 0 = 3)
Find the facts that involve adding zero on the cards on
the Counting Strategies and Reasoning Strategies
charts from Lesson 3. Move the cards together on the
chart and label the group of facts "Zero."
