math module 1 lesson 16 use the distributive property to find related multiplication facts
TRANSCRIPT
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Math Module 1Lesson 16Use the Distributive Property to find related multiplication facts.
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Multiply by 4 Pattern Sheet
2 minutes
End
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4 x 7 = Let’s skip-count to solve.
Skip Count by 4s
48
12
16
20 24
4 x 7 = 28
28
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Skip Count By 2s To 20 … 2 4 6 8 10 12 14 16 18 20
Skip Count by 3s to 30 … 3 6 9 12 15 18 21 24 27 30
Skip Count
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Tape Diagram Review
Write an addition sentence for this tape diagram:
8 + 8 = 16
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Tape Diagram Review
Write a multiplication sentence for this tape diagram:
2 x 8 = 16
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Tape Diagram Review
Write a multiplication sentence for this tape diagram:
8 16
2 x 8 = 16
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Problem of the Day
Ms. Williams seats students in 4 rows of 7when she teaches at Board 1:
XXXXXXXXXXXXXXXXXXXXXXXXXXXX
4 x 7
Use the Commutative Property to show how she seats them when she teaches at Board 2.
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Problem of the Day
Board 2:
XXXX XXXX
XXXXXXXXXXXXXXXXXXXX
7 rows of 4!7 x 4
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Problem of the Day
Bonus!!!
On Monday 6 students are absent. How many students are in Ms. Williams class on Monday?
4 x 7 = 2828 - 6 = 22
There are 22 students in class on Monday!
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Concept Development
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Talk to your partner about how to box an array that shows:
(5 x 4) + (1 x 4)
What fact does the whole array represent?
6 x 4
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Concept Development
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Talk to your partner about how to box an array that shows:
(5 x 4) + (2 x 4)
What fact does the whole array represent?
7 x 4
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Concept Development
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Talk to your partner about how to box an array that shows:
(5 x 4) + (4 x 4)
What fact does the whole array represent?
9 x 4
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Concept Development
What math fact did we use to solve all 3 problems?
5 X 4Discuss with your neighbor: Why did we use 5 x 4 to solve all three problems?
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Concept Development
And the answer is …..
Because 5sare easy to solve!
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Concept Development
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What multiplication fact does this array represent?
8 x 4
Use the 5s strategy to solve this problem
8 fours
5 fours
3 fours
True or False: In 5 x 4 & 3 x 4 the size of the groups is the
same.
True20 12
32
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PROBLEM SET…The key is in how YOU look at it!