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Unit 4 - Lesson 16 - Grade 3: Illustrative Mathematics
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Lesson: Multiply Numbers Larger than 20
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Cool Down: Multiply Numbers Greater than 20
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Grade 3 Unit 4
Lesson 16: Multiply Numbers Larger than 20
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 4
Lesson 16: Multiply Numbers Larger than 20
CC BY 2021 Illustrative Mathematics®
Number Talk: Three Times Some Numbers (Warm Up)
Find the value of each expression mentally.
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Question 1
1.
3 x 10
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Question 2
2.
3 x 20
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Question 3
3.
3 x 50
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4 x 23 Represented
Here is how Clare and Andre represented 4 x 23.
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Question 5
5.
How does each diagram show 4 x 23?
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Question 6
6.
How could we use Clare’s diagram to find the value of 4 x 23?
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Question 7
7.
How could we use Andre’s diagram to find the value of 4 x 23?
Diego tried different ways to partition or split a diagram to help him find the value of 4 x 23.
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Question 8
8.
What do you notice about the numbers in his diagrams?
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Question 10
10.
Explain your reasoning.
Question 11
11.
Find the value of 3 x 28. Show your thinking using diagrams, symbols, or other representations.
visibility
View drawing
Some Fine Products
Question 12
12.
To find the value of 2 x 37, Mai started by writing this equation:
2 x 30 = 60
Describe or show what Mai would do to finish finding the value of 2 x 37.
visibility
View drawing
Question 13
13.
Find the value of the product. Show your reasoning.
3 x 32
visibility
View drawing
Question 14
14.
Find the value of the product. Show your reasoning.
2 x 43
visibility
View drawing
Question 15
15.
Find the value of the product. Show your reasoning.
4 x 22
visibility
View drawing
Question 16
16.
Find the value of the product. Show your reasoning.
3 x 29
visibility
View drawing
Play Close to 100, Multiplication (Optional)
Play Close to 100, Multiplication with a partner.
1. Place the cards face down.
2. Each player draws 4 cards.
3. 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.
4. Player closest to 100 wins.
5. Play 5 rounds. Player who wins the most rounds wins.
Game 1
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Question 17
17.
Round 1
_______ x 1 _______ = _______
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Question 18
18.
Round 2
_______ x 1 _______ = _______
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Question 19
19.
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1
Game 2
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Question 22
22.
Round 1
_______ x 1 _______ = _______
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Question 23
23.
Round 2
_______ x 1 _______ = _______
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Question 24
24.
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Question 27
27.
What’s the value of 4 x 24? Explain or show your reasoning.
visibility
View drawing
Question 4
4.
3 x 25
Question 9
9.
Which diagram would you use to find the value of 4 x 23?
Round 3
_______ x 1 _______ = _______
Question 20
20.
Round 4
_______ x 1 _______ = _______
Question 21
21.
Round 5
_______ x 1 _______ = _______
Round 3
_______ x 1 _______ = _______
Question 25
25.
Round 4
_______ x 1 _______ = _______
Question 26
26.
Round 5
_______ x 1 _______ = _______