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RCN Lesson 11: Multiplying 2 Two-digit Numbers

Last updated over 2 years ago
19 questions
Develop Understanding
Today's Learning Goal (G4, U6, L5,8,12):
  • Multiply 2 two-digit numbers using place value understanding and properties of operations.
Today's Materials:
  • Laptop
  • Laptop charger
  • Pen/Pencil/Paper (optional)
Please complete the Jump Start (activator). You have 5 minutes before we review. This is independent it should be silent.
Reminders:
1. Ready for class
2. No cellphones
3. Volume must be low.
4. Read and follow all directions
5.) Take your bag off and immediately begin the Activator.

Jump Start - (5 min)

NO CALCULATORS will be used throughout this lesson.


Required
1

20 x 60

Required
1

21 x 60

Required
1

20 x 62

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1

19 x 60

Launch - Standard Multiplying Two-digit Algorithm. (7 min)

I'll model question 5
We'll try question 6
You try question 7
0

15 x 12

0

34 x 29

Required
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67 x 53

Activity 1 - Elena’s Sticky Gift (10 min)

Complete questions 8 - 12.

Show your work. Work agmost your group.
Elena receives 4 sheets of fancy stickers as a gift. How many stickers does each sheet have? Explain or show how you would find out without counting every sticker.
Sheet 1:
Sheet 2:
Sheet 3:
Sheet 4:
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0

Sheet 1 has?

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Sheet 2 has?

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Sheet 3 has?

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Sheet 4 has?

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0

How many total stickers does have Elena have?

Activity 2 - Two by Two (10 min)

Complete questions 13-17

Show your work.
These diagrams could be used to find the value of 49 x57.
Required
0

Which diagram is more helpful when finding the value of 49 x 57?

Write a multiplication expression and then find the value of the expression. Use equations to show or explain your reasoning.
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Lesson Sythnesis - ( 5 min)


Today we learned:
  • How to represent the multiplication of 2 two-digit numbers using a rectangular diagram
  • Use standard two-digit multiplying algorithm to find values of multiplication expressions
  • We learned that we can decompose each factor by place value and show the tens and ones on each side of the rectangle, and that doing this can help us to multiply efficiently.

Required
0

Why might it be more helpful to decompose 55 into 50 + 5 than into
42 +13?

Cool Down - (5 min)

Required
4

In a leap year, the month of February has 29 days. How many hours are in that month? Show your reasoning

Should be done independently and silently.

Closure Questions:

  • What strategies from today's lesson you liked the most?
  • what is this called and name the components: 10 x 13 = 130