Lesson 16 Multiply Numbers Larger than 20
Let’s multiply numbers that are larger than 20.
Warm-up Number Talk: Three Times Some Numbers
Find the value of each expression mentally.
Activity 1 4 \times 23, Represented
Here is how Clare and Andre represented
How does each diagram show
How could we use Clare’s diagram to find the value of
How could we use Andre’s diagram to find the value of
Diego tried different ways to partition or split a diagram to help him find the value of
What do you notice about the numbers in his diagrams?
Which diagram would you use to find the value of
? Explain your reasoning.
Find the value of
Activity 2 Some Fine Products
To find the value of
Describe or show what Mai would do to finish finding the value of
Find the value of each product. Show your reasoning.
Activity 3 Play Close to 100, Multiplication
Play Close to 100, Multiplication with a partner.
Place the cards face down.
Each player draws 4 cards.
Each player chooses 2 cards to complete the expression to make a value as close to 100 as possible. Write the 2 digits and the product.
Player closest to 100 wins.
Play 5 rounds. Player who wins the most rounds wins.
Find the value of each expression. Explain or show your reasoning.