Lesson 9 Multiplication Game Day

- Let’s play multiplication games.

Warm-up Number Talk: Multiplying Large Factors

Find the value of each expression mentally.

$4 \times 10$
$4 \times 20$
$4 \times 21$
$4 \times 24$

Activity 1 Introduce Rectangle Rumble and How Close?

Directions for Rectangle Rumble:

Choose a color for your rectangles different from your partner.
Each partner:
- Spin each spinner.
- Shade in a rectangular area to represent the product of the two numbers.
- Take turns until the grid can’t fit any more rectangles.
Add up your total area. The partner with the greatest total square units wins.

Directions for How Close?:

Each partner:
- Take 4 cards.
- Choose 2–3 cards to multiply.
- Write an equation to show the product of the numbers you chose.
- Your score for each round is the difference between your product and 100.
Take new cards so that you have 4 cards to start the next round.
At the end of the game, add your scores from each round. The player with the lowest score wins.

Activity 2 Choice Time: Multiplication Games

Choose a center to practice multiplying within 100.

Compare, Multiply within 100: Decide which expression has the greatest value.
How Close? Multiply to 100: Choose 2–3 numbers to multiply to get a product closest to 100.
Rectangle Rumble, Factors 1–10: Multiply numbers to create rectangular areas to fill a grid with the most squares.