RCN Lesson 20: Standard Algorithm: Multi-digit Numbers without Composing

Last updated over 3 years ago

13 Nsɛmmisa

Lanuch - (10 min)

I'll model question 2

We'll Try question 3

You Try question 4

RCN Lesson 20: Standard Algorithm: Multi-digit Numbers without Composing

Last updated over 3 years ago

13 Nsɛmmisa

Develop Understanding

Today's Learning Goal: (G5, U4, L5)

Use the standard algorithm to multiply up to three-digit numbers and two-digit numbers, without composing new units.

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: Partial Products

(5 MIN)

Find the value of each product mentally.

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20 x 3

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24 x 3

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Lanuch - (10 min)

I'll model question 2

We'll Try question 3

You Try question 4

ACTIVITY 1: Compare Two Algorthims - (15 min)

Two algorithms for finding the value of 413 x 21 are shown below:

Algorthim 1:

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Algorthim 2:

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How are the two algorithms the same? How are they different?

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Explain or show where you see each step from the first algorithm in the second algorithm.

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ACTIVITY 2: Use the Standard Algorithm - (15 min)

Use the standard algorithm to find the value of each expression.

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202 x 12

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122 x 33

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321 x 24

Diego found the value of 301 x 24 Here is his work.

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LESSON SYNTHESIS - (5 MIN)

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Find the value of 322 x 41 using the standard algorthim.

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322 x 41

COOL DOWN - Standard Algorithm without Composition of a New Unit

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Use the standard algorithm to find the value below: (SHOW YOUR WORK)

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203 x 23

5.NBT.5

Closure Questions:

The steps from Activity 1 are called what?
Name the components in the equation:
10 x 12 = 120
What is the algorithm we used today to multiply two two-digit numbers

RCN Lesson 20: Standard Algorithm: Multi-digit Numbers without Composing

Lanuch - (10 min)

I'll model question 2

We'll Try question 3

You Try question 4

RCN Lesson 20: Standard Algorithm: Multi-digit Numbers without Composing

JUMP START: Partial Products

(5 MIN)

20 x 3

24 x 3

Lanuch - (10 min)

I'll model question 2

We'll Try question 3

You Try question 4

ACTIVITY 1: Compare Two Algorthims - (15 min)

Two algorithms for finding the value of 413 x 21 are shown below:

How are the two algorithms the same? How are they different?

Explain or show where you see each step from the first algorithm in the second algorithm.

ACTIVITY 2: Use the Standard Algorithm - (15 min)

202 x 12

122 x 33

321 x 24

LESSON SYNTHESIS - (5 MIN)

322 x 41

COOL DOWN - Standard Algorithm without Composition of a New Unit

203 x 23

Closure Questions:

JUMP START: Partial Products

(5 MIN)

20 x 3

24 x 3

120 x 3

140 x 3

ACTIVITY 1: Compare Two Algorthims - (15 min)

Two algorithms for finding the value of 413 x 21 are shown below:

How are the two algorithms the same? How are they different?

Explain or show where you see each step from the first algorithm in the second algorithm.

How do the final steps in the two algorithms compare?

ACTIVITY 2: Use the Standard Algorithm - (15 min)

202 x 12

122 x 33

321 x 24

Why doesn’t Diego’s answer make sense?

LESSON SYNTHESIS - (5 MIN)

322 x 41

COOL DOWN - Standard Algorithm without Composition of a New Unit

203 x 23

Closure Questions:

120 x 3

140 x 3

How do the final steps in the two algorithms compare?

Why doesn’t Diego’s answer make sense?