Section A: Practice Problems Develop Fluency with Addition and Subtraction within 10

Section Summary

Details

We practiced adding within 10.

We counted on.

Two-color counters. Red, 4. Yellow 3, with labels 5, 6, 7. 

We added in any order.

is the same amount as .

Two-color counters. Top row, 4 red, 3 yellow. Bottom row, 3 yellow, 4 red.

We learned that when expressions have the same value, you can show that with an equal sign.

We learned that we can use addition to find the difference between 2 numbers.

Since I know 6 + 4 = 10, then I know 10 - 6 = 4.

Ten frame. 6 counters. Empty boxes with labels 1, 2, 3, 4.

Problem 1 (Pre-Unit)

For each picture, write a number for how many you see.

  1. Dots. 2 groups of 9 dots.
  2. Ten frame, full. Below, 7 counters.
  3. Squares arranged in a circle.

Problem 2 (Pre-Unit)

Match each picture with an expression.

  1. Ten frame, full. Below, 4 counters.
  2. Ten frame, full. Below, 8 counters.
  3. Five frame, full. Below, 4 counters.
  4. Ten frame, full. Below, 6 counters.

Problem 3 (Pre-Unit)

There were 5 monkeys swinging in the tree.
Then 2 more monkeys came to join them.
How many monkeys are in the tree now?
Show your thinking using drawings, numbers, or words.

Problem 4 (Lesson 1)

Find the value of each sum.

Problem 5 (Lesson 2)

Find the value of each sum.

Problem 6 (Lesson 3)

Select 3 true equations.

Problem 7 (Lesson 4)

  1. Write an equation that matches this 10-frame.

    Ten frame, full. 9 red counters. 1 yellow counter.

  2. Write 2 equations that show other ways to make 10.

Problem 8 (Lesson 5)

Find the value of each expression.
Show your thinking using drawings, numbers, or words.

Problem 9 (Lesson 6)

There are some counters in the cup.
Lin puts in 5 more counters.
Now there are 9 counters in the cup.
How many counters were in the cup before Lin added more?
Show your thinking using drawings, numbers, or words.

Problem 10 (Exploration)

Here are some numbers:

1

2

4

5

7

  1. Can you make 10 using 2 of the numbers? Show your thinking using drawings, numbers, or words.

  2. Can you make 10 using 3 of the numbers? Show your thinking using drawings, numbers, or words.

Problem 11 (Exploration)

Find the number that makes each equation true.
Show your thinking using drawings, numbers, or words.