1. 5th Grade Module 2 – Lesson 9
Lesson 9: I can fluently multiply multi-digit whole numbers using the standard algorithm to solve multi-step word problems.
5th Grade Module 2 – Lesson 9

2. Multiply and Divide by Exponents
Millions
Hundred Thousands
Ten Thousands
Thousands
Hundreds
Tens
Ones
Tenths
Hundredths
Thousandths 4 5 4 5
Multiply it by 102
Write 45 tenths as a decimal.
Say the decimal.
5th Grade Module 2 – Lesson 9

3. Multiply and Divide by Exponents
Millions
Hundred Thousands
Ten Thousands
Thousands
Hundreds
Tens
Ones
Tenths
Hundredths
Thousandths 4 4
Multiply by 102
Write 4 tenths as a decimal.
Say the decimal.
5th Grade Module 2 – Lesson 9

4. Multiply and Divide by Exponents
Millions
Hundred Thousands
Ten Thousands
Thousands
Hundreds
Tens
Ones
Tenths
Hundredths
Thousandths 4 4
Divide by 102
Write 4 tenths as a decimal.
Say the decimal.
5th Grade Module 2 – Lesson 9

5. Multiply and Divide by Exponents
Millions
Hundred Thousands
Ten Thousands
Thousands
Hundreds
Tens
Ones
Tenths
Hundredths
Thousandths 8 9 5 3 5 9 8 3
Write three and eight hundred ninety five thousandths as a decimal.
Multiply by 103
Say the decimal.
5th Grade Module 2 – Lesson 9

6. Multiply and Divide by Exponents
Millions
Hundred Thousands
Ten Thousands
Thousands
Hundreds
Tens
Ones
Tenths
Hundredths
Thousandths 4 7 2 5 4 7 2 5
Write 5,472 as a decimal.
Divide by 103
Say the decimal.
5th Grade Module 2 – Lesson 9

7. 5th Grade Module 2 – Lesson 9
Estimate Products
421 x 231 ≈ ____ x ___ = ____
400
200
80,000
On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product.
5th Grade Module 2 – Lesson 9

8. 5th Grade Module 2 – Lesson 9
Estimate Products
523x 298≈ ____ x ___ = ____
500
300
15,000
On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product.
5th Grade Module 2 – Lesson 9

9. 5th Grade Module 2 – Lesson 9
Estimate Products
684x 347≈ ____ x ___ = ____
700
300
21,000
On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product.
5th Grade Module 2 – Lesson 9

10. 5th Grade Module 2 – Lesson 9
Estimate Products
908 x 297 ≈ ____ x ___ = ____
900
300
27,000
On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product.
5th Grade Module 2 – Lesson 9

11. Let’s read the word problem aloud.
An office space in New York City measures 48 feet by 56 feet. If it sells for $565 per square foot, what is the selling price of the office space?
Concept Development
How do we solve this problem? Turn and talk.
Let’s read it again sentence by sentence and draw as we go...
We are going to solve the first page of problems from your Problem Set together!
Please open to page 2.B.85
Let’s read the word problem aloud.
56 x 48 = 2688 sq ft
56 ft
48 ft
$565 each
2688 x $565 =
$1,518,720
The cost of the office space is
$1,518,720
5th Grade Module 2 – Lesson 9

12. 5th Grade Module 2 – Lesson 9
Concept Development
Gemma and Leah are both jewelry makers. Gemma made 106 beaded necklaces. Leah made 39 more necklaces than Gemma.
Each necklace they make has exactly 104 beads on it. How many beads did both girls use altogether while making their necklaces.
At a recent craft fair, Gemma sold her necklaces for $14 each. Leah sold her necklaces for $10 more. Who made more money at the craft fair? How much more?
5th Grade Module 2 – Lesson 9

13. Let’s draw a tape diagram to help us…
Each necklace used 104 beads. How can we find the total number of beads?
Gemma
106
Leah 39
145
(106 x 104) + (145 x 104)
= 11, ,080 = 26,104
Both girls used 26,104 beads altogether.
5th Grade Module 2 – Lesson 9

14. Leah made more money. Leah made $1996 more than Gemma.
Let’s solve Part B now…
Gemma
106
Leah
145
(145 x 24) - (106 x 14) =
= $1996
5th Grade Module 2 – Lesson 9

15. Get Ready to Complete the Rest of the Problem Set on Your Own!
Complete Page 2.B.86 You will have 10 minutes to work. Try your Best!
5th Grade Module 2 – Lesson 9

16. 5th Grade Module 2 – Lesson 9
Debrief
Share and explain to your partner the numerical expression you wrote to help you solve Problems 3 and 5
Explain how Problems 3 and 5 could both be solved in more than one way
What type of problem are Problem 1 and Problem 5? How are these two problems different from the others?
5th Grade Module 2 – Lesson 9

17. 5th Grade Module 2 – Lesson 11
EXIT
TICKET
Page 2.B.87
5th Grade Module 2 – Lesson 11