1. Multiply by Multiples of 10 using the place value chart.
Module 3 Lesson 21
Multiply by Multiples of 10 using the place value chart.

2. Skip Count Skip Count By 6s To 60 … Skip Count By 7s To 70 …
Skip Count By 7s To 70 …
Skip Count by 8s to 80 …
Skip Count by 9s to 90 …

3. Fluency Practice = 10 10 x 9 10 x 1 = 40 =90 10 x 7 10 x 2 10 x 4 = 70
I will say a fact, you say the whole equation: For example, if I said 10 x 1, you will say 10 x 1 = 10 Thumbs up if you understand.
= 10
10 x 9
10 x 1
= 40
=90
10 x 7
10 x 2
10 x 4
= 70
= 20
= 30
10 x 8
= 50
10 x 3
= 80
10 x 5

4. Fluency Practice 10 10 x 9 10 x 1 40 90 10 x 7 10 x 2 10 x 4 70 20 30
I will say a product of 10, you say the whole equation: For example, if I said 40, you will say 10 x 4 = 40 Thumbs up if you understand. 10
10 x 9
10 x 1 40 90
10 x 7
10 x 2
10 x 4 70 20 30
10 x 8 50
10 x 3 80
10 x 5

5. Say the multiplication equation in unit form
Fluency Practice
2 × 3 = ____.
Say the multiplication equation in unit form
2 ones × 3 ones = 6 ones
Say it in standard form.
2 × 3 = 6

6. Could we make the units anything we want?
Fluency Practice 6
2 ones × 3 cats
2 × 3 = ____
Could we make the units anything we want?
How about …
2 ones × 3 cats = 6 cats!

7. 12 Fluency Practice 3 × 4 = ____ 3 ones × 4 dogs
And what if our unit is …
3 ones × 4 dogs = 12 dogs!

8. 20 Fluency Practice 4 × 5 = ____ 4 ones × 5 pencils
And what if our unit is …
4 ones × 5 pencils = 20 pencils!

9. 30 Fluency Practice 5 × 6 = ____ 5 ones × 6 turtles
And what if our unit is …
5 ones × 6 turtles = 30 turtles!

10. Exchange Place Value Disks
Make an array with place value disks that shows 3 x 2 ones.

11. Exchange Place Value Disks
Make an array with place value disks that shows 3 x 3 ones.

12. Exchange Place Value Disks
Make an array with place value disks that shows 4 x 2 ones.

13. Exchange Place Value Disks
Ten ones can be exchanges for 1 disk of what unit?
Make an array with place value disks that shows 5 x 2 ones.

14. Exchange Place Value Disks
Make an array with place value disks that shows 4 x 5 ones.
5 x 4 ones = 20 ones
Say the answer in units of 10
5 x 4 ones = 2 tens

15. Multiply by multiples of 10 using Place Value Disks
Use your disks to show 2 rows of 3 ones. 6
2 x 3 ones = ______ ones
Our array shows this equation, right?
Right!
Now change your array to show 2 rows of 3 tens.
Say our new equation in standard form:
2 x 30 = 60

16. Multiply by multiples of 10 using Place Value Disks
Use your disks to show 3 rows of 4 ones. 12
3 x 4 ones = ______ ones
Our array shows this equation, right?
Right!
Now change your array to show 3 rows of 4 tens.
Say our new equation in standard form:
3 x 40 = 120

17. Multiply by multiples of 10 using Place Value Disks
Use your disks to show 2 rows of 6 ones. 12
2 x 6 ones = ______ ones
Our array shows this equation, right?
Right!
Now change your array to show 2 rows of 6 tens.
Say our new equation in standard form:
2 x 60 = 120

18. Multiply Multiples of 10 using a Place Value Chart
Write equations for this array in both unit and standard forms.
It is exactly the same as the ones array, it just uses units of 10. Let’s write equations for this array in both unit and standard form:
What do you notice about the number of circles in this array?
2 x 5 tens = 10 tens
2 x 50 = 100
2 x 5 ones = 10 ones
2 x 5 = 10

19. Discuss with your partner how your would solve:
Multiply Multiples of 10
Let’s use that strategy to solve another multiplication fact:
If 3 x 6 ones = 18
Than what does 3 x 6 tens equal?
180!
Could we use this strategy to solve a harder fact?
Discuss with your partner how your would solve:
80 x 6

20. Multiply Multiples of 10 8 x 6 = 4 8

21. Multiply Multiples of 10 9 x 7 = 6 3

22. Multiply Multiples of 10 6 x 4 = 2 4

23. Multiply Multiples of 10 7 x 8 = 5 6

24. Smile & Solve Boys! Just Smile & Solve.
PROBLEM SET
Smile & Solve Boys! Just Smile & Solve.