Lesson 3 Addition and Subtraction with Tens

    • Let’s add and subtract 10.

Warm-up How Many Do You See: Groups of 10

How many do you see?
How do you see them?

  1. Connecting cubes. 2 towers of 10.
  2. Connecting cubes. 4 towers of 10 cubes.
  3. Base ten drawing. 4 tens.

Activity 1 How Many Tens Now?

Problem 1

  1. Show 1 ten.
    Add a ten.
    How many do you have now?

  2. Add another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  3. Add another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  4. Add another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  5. Add another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  6. Add another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  7. Add another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  8. Add another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

Problem 2

  1. Show 9 tens
    Take away a ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  2. Take away another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  3. Take away another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  4. Take away another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  5. Take away another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  6. Take away another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  7. Take away another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

  8. Take away another ten.
    How many do you have now?
    Show your thinking using drawings, numbers, or words.

Activity 2 Introduce Five in a Row: Add or Subtract 10

Center activity. Five in a row.

Record your favorite round.
Show your thinking using drawings, numbers, or words.

Activity 3 Centers: Choice Time

Choose a center.

Five in a Row

Center activity. Five in a row.

How Close?

Center. How Close.

Number Puzzles

Center activity. Number Puzzles.

Practice Problem

Problem 1

  1. How many connecting cubes are in the picture?

    Connecting cubes. 4 towers of 10 cubes.

  2. Circle the picture that shows 10 more connecting cubes. Cross out the picture that shows 10 fewer connecting cubes.

    A
    Connecting cubes. 3 towers of 10 cubes.
    B
    Connecting cubes. 4 towers of 10 cubes.
    C
    Connecting cubes. 5 towers of 10 cubes.