Objective: Understand and apply the Commutative Property of Addition for sums within 20.

Lesson 3.2-Count On

Objective: Use count on 1, 2, or 3 as a strategy to find sums within 20.

Vocabulary:

- Count on

Lesson 3.3- Add Doubles

Objective: Use doubles as a strategy to solve addition facts with sums within 20.

Vocabulary:

- Doubles

Objective: Use doubles to create equivalent but easier sums.

Lesson 3.5- Doubles Plus 1 and Doubles Minus 1

Objective: Use doubles plus 1 and doubles minus 1 as strategies to find sums within 20.

Vocabulary:

- doubles minus one
- doubles plus one

Objective: Use the strategies count on, doubles, doubles plus 1, and doubles minus 1 to practice addition facts within 20.

Lesson 3.7-Add 10 and More

Objective: Use a ten frame to add 10 and an addend less that 10.

Lesson 3.8- Make a 10 to Add

Objective: Use make a ten as a strategy to find sums within 20.

Vocabulary:

- make a ten

Objective: Use numbers to show how to use the make a ten strategy to add.

Lesson 3.10- Add 3 Numbers

Objective: Use the Associative Property of Addition to add three addends.

Lesson 3.11-Add 3 Numbers

Objective: Understand and apply the Associative Property or Commutative Property of Addition to add three addends.

Lesson 3.12- Use Addition Strategies

Objective: Solve adding to and putting together situations using the strategy draw a picture.

Chapter 3 Review