Lesson 2 Explore Expressions and Sums
Let’s write addition expressions and find the sum of two numbers.
Warm-up Choral Count: Count to 41
Count by 1, starting at 0.
What patterns do you see?
Activity 1 Matching Dot Cards and Expressions
Problem 1
Match each pair of dots to an expression. Then, find the total.
expression | total |
---|---|
Problem 2
Draw the missing dots to match the expression. Then, find the total.
Expression:
Total:
Expression:
Total:
Expression:
Total:
Problem 3
Write the missing expression to match the dots. Then, find the total.
Expression:
Total:
Expression:
Total:
Activity 2 Introduce: Check it Off, Add within 10
Take turns choosing two cards, finding the sum, and writing an addition expression. You may have more than one expression for each sum.
Practice Problems
Problem 1
Circle the expression that matches the dots.
Problem 2
Circle the dots that match the expression: