Multiply and Divide by 10, 100 and 1000

What do we do when we x by 100?

• Move it up a column

• Move it down a column

• Move it up 2 columns

• Move it down 2 columns

When we divide by 1000 we have to:

• Move it up 3 columns

• Move it down 3 columns

• Move it up 2 columns

• Take away a nought

What is 100 x 2

• 20

• 2

• 0.2

• 200

What is 30 x 10

• 3000

• 3

• 0.3

• 300

What is 100 x 15

• 150

• 15000

• 1500

• 1.5

What is 16.1 x 10

• 1610

• 1601

• 161

• 160.1

What is 103  $\div$  10  

• 13

• 103

• 31

• 10.3

If I had 5 dogs in each of my 100 mansions how many dogs would I have?

• 50

• 500

• 5000

• 5

If I gave everyone in Gold Class 10 biscuits each and there are 32 in my class how many biscuits would I need?

• 3200

• 32

• 132

• 320

There are about 210 children in Grayshott school, if everyone got 100 housepoints how many would that be altogether?

• 210

• 21

• 2100

• 21000