Multiplying by Multiples of 10

Multiplying by Multiples of 10

Using number disks and place value charts to understand Multiplying by Multiples of 10

MGSE3.NBT.3

I can multiply by multiples of 10 in the range 10-90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.

Essential Question

How does knowing basic multiplication facts and understanding place value help when multiplying one-digit whole numbers by multiples of ten?

 $2\times3$  

•  $2\times3$  ones

•  $6$  ones

•  $6$  ones  $=6$  

•  $2\times3=6$  

 $2\times30$  

•  $2\times3$  tens

•  $6$  tens

•  $6$  tens $=60$  

•  $2\times30=60$  

Open Ended

How is  $2\times30$  similar to  $2\times3$ ?

Poll

How do you feel about multiplying by multiples of 10 using number disks?

• This makes perfect sense. I've got this!

• I'll have it after a few practice examples.

• Could you explain that one more time?

Multiple Choice

3 x 30

• 9 ones

• 330

• 9 tens

• 33

Multiple Choice

3 x 50

• 350

• 150

• 15

• 53

 $2\times5$  

•  $2\times5$  ones

•  $10$  ones

•  $10$  ones $=10$  

•  $2\times5=10$  

 $2\times50$  

•  $2\times5$  tens

•  $10$  tens

•  $10$  tens $=100$  

•  $2\times50=100$  

Open Ended

What changed from

 $2\times5$  to $2\times50$  ?

Poll

How do you feel about multiplying by multiples of 10 using a place value chart?

• This makes perfect sense. I've got this!

• I'll have it after a few practice examples.

• Could you explain that one more time?

Multiple Choice

 $2\times4$  

• 8

• 6

• 80

• 8 tens

Multiple Choice

 $2\times4$  tens

• 80

• 8

• 6

• 60

Open Ended

What changed from

 $2\times4$  to $2\times40$  ?

Multiple Choice

 $4\times5$ 

• 20 tens

• 9

• 20

• 45

Multiple Choice

 $4\times50$ 

• 450

• 200

• 20 ones

• 200 tens

Open Ended

What changed from

 $4\times5$  to $4\times50$  ?

Poll

How do you feel about multiplying by multiples of 10?

• This makes perfect sense. I've got this!

• I'll have it after practicing a few more times.

• I need my teacher to help me more with this.