Multiplying by Groups of Ten

Multiplying by Multiples of 10

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

 $2\times3$  

•  $2\times3$  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 $$4\times50$$  ?