1. Mental strategies for multi-digit whole number multiplicati0n
Topic A
Mental strategies for multi-digit whole number multiplicati0n
STANDARD - 5.NBT.1
5.NBT.2

2. Grade 5
Module 2 Lesson 1
Objective:
Estimate multi-digit products by rounding factors to a basic fact and using place value patterns

3. MATERIALS NEEDED FOR THIS LESSON Student Student Pages Teacher
Personal White Boards
Sprint Pages
Problem Set
Exit Ticket
Homework
Teacher
Teacher Pages

4. Fluency Practice (12 minutes)

5. Multiply by 10, 100 and 1,000
3 minutes
5.NBT.1
Sprint pages 2.A.21

6. Multiply by 10, 100 and 1,000
3 minutes
5.NBT.1
Sprint pages 2.A.22

7. Between which two ten-thousands is 48,625?
Round to different place values
2 minutes
5.NBT.1
48,625
Say the number
Between which two ten-thousands is 48,625?
What is the mid-point for 40,000 and 50,000?
Would 48,625 fall above or below 45,000?
48,265= _________
What's 48,625 rounded to the nearest ten-thousand?

8. Between which two thousands is 48,625?
Round to different place values
2 minutes
5.NBT.1
48,625
Between which two thousands is 48,625?
What is the mid-point for 48,000 and 49,000?
Would 48,625 fall above or below 48,500?
48,265= _________
What's 48,625 rounded to the nearest thousand?

9. Between which two hundreds is 48,625?
Round to different place values
2 minutes
5.NBT.1
48,625
Between which two hundreds is 48,625?
What is the mid-point for 48,600 and 48,700?
Would 48,625 fall above or below 48,650?
48,265= _________
What's 48,625 rounded to the nearest hundred?

10. Between which two tens is 48,625?
Round to different place values
2 minutes
5.NBT.1
48,625
Between which two tens is 48,625?
What is the mid-point for 48,620 and 48,630?
Would 48,625 fall above or below 48,625?
48,265= _________
What's 48,625 rounded to the nearest ten?

11. 31 x 10 = _______ 310 x 2 = _______ 310 x 20 = ______
Multiply by Multiples of 10
3 minutes
5.NBT.1
31 x 10 = _______
310 x 2 = _______
310 x 20 = ______
Write 310 x 20 as a three-step multiplication problem taking out the ten.
310 x 20= 310 x 10 x 2 = 6,200

12. Multiply by Multiples of 10
3 minutes
5.NBT.1
23 x 40 = _______
Write 23 x 40 as a three-step multiplication problem taking out the ten.
23 x 40 = 23 x 4 x 10 = 920

13. Multiply by Multiples of 10
3 minutes
5.NBT.1
32 x 30 = _______
Write 32 x 30 as a three-step multiplication problem taking out the ten.
32 x 30 = 32 x 3 x 10 = 960

14. Application Problem (8 minutes)
Jonas practices guitar 1 hour a day for 2 years. Bradley practices the guitar 2 hours a day more than Jonas. How many more minutes does Bradley practice the guitar than Jonas over the course of 2 years?

15. Concept Development (30 minutes)

16. How many students do we have in our class?
Does every class have the same number of students?
There are 38 classes here at Diamond Canyon. How could we find a number that is close to the actual number of students in our school?

17. 456 x 42 = __________
4,560 x 42 = _________
4,560 x 420 = _________

18. 1,320 x 88 = __________
13,205 x 880 = _________
3,120 x 880 = _________

19. Problem Set (10 minutes) Do Your Personal Best
(Complete independently!)

20. Student Debrief (10 minutes)
When might expanded form be useful as a 
calculation tool?
Which tasks in #1 are alike? Why?
How is expanded form related to the standard 
form of a number?
What is the purpose of writing a decimal 
number in expanded form using fractions? 
What was the objective of our lesson today?
Compare your answers to #1 c and d. What is 
the importance of the word and when naming 
decimals in standard form?

21. EXIT TICKET (3 minutes)
Complete the exit ticket and turn in...

22. HOMEWORK