Lesson 4

Doubles +1, Doubles −1

Est. Class Sessions: 1–2

Developing the Lesson

Part 2: Play Doubles, Doubles +1, Doubles −1

Direct students to the Doubles, Doubles +1, Doubles −1 pages in the Student Activity Book as you display the recording sheet. Ask for a volunteer to help you demonstrate the game. Play two or three rounds before asking students to play this game with a partner. Make sure students have access to connecting cubes to use as they play the game.

After students have played several rounds, use Questions 1–2 to summarize what they notice about the sums and then ask:

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  • When you are adding doubles what do you notice about both of the numbers you are adding? (Possible responses: They are both the same. They are both either odd or even.)
  • What do you notice about the sums for all of the doubles? (The sums are always even.)
  • What do you notice about the two numbers when you are adding doubles +1 or doubles −1? (Possible response: One of the numbers is odd and one is even.)
  • Are the sums odd or even when you are adding doubles +1 or doubles −1? (The sums are always odd.)

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Students will need the spinners from the Doubles,
Doubles +1, Doubles −1 pages for another activity later in this lesson. Ask students to keep the page in a safe place.
Student Guide:
Student Activity Book: 375 376 377
Answers
X
SAB_Mini
+
X
SAB_Mini
+
X
SAB_Mini
+
Master: