tuesday multiplication and division.notebook

1

June 19, 2020

23/06/20L.I To multiply and divide whole numbers and those involving decimals by 10, 100 and 1,000

White boardsQuick fire multiplication and division, check on next slide

a) 6 x 5=b) 12 x 8=c) 9 x 4=d) 11 x 10=e) 7 x 8=

a) 65/5=b) 36/9=c)72/12=d)56/8=e)35/7=

30963611056

134675

tuesday multiplication and division.notebook

2

June 19, 2020

23/06/20L.I To multiply and divide whole numbers and those involving decimals by 10, 100 and 1,000

White boardsQuick fire multiplication and division

a) 6 x 5=b) 12 x 8=c) 9 x 4=d) 11 x 10=e) 7 x 8=

a) 65/5=b) 36/9=c)72/12=d)56/8=e)35/7=

30963611056

134675

tuesday multiplication and division.notebook

3

June 19, 2020

multiplying and dividing by 10,100,1000 is all about place value:

6

Thousands hundreds tens units tenths hundredths thousandths tens of thousands

tuesday multiplication and division.notebook

4

June 19, 2020

multiply division

x 10 move one place to the right x100 move two places to the rightx1000 move three places to the right

/10 move one place to the left/100 move two places to the left/1000 move three places to the left

tuesday multiplication and division.notebook

5

June 19, 2020

Here you go..Practice: 6 x 10 = 60 54 10 = 5.4

write the whole question down

a) 678 100=

b) 53x 10=

c) 289 100=

d) 783x1000=

e) 6.33 10 =

f) 1.23 x 100=

g) 99.34 100=

h) 135 x 10=

i) 789 1000=

j) 6.446 x 100=

k) 4678.3 10=

l) 67.4x100=

tuesday multiplication and division.notebook

6

June 19, 2020

Did you get the answers right?Practice: 6 x 10 = 60 54 10 = 5.4

write the whole question down

a) 678 100=6.78

b) 53x 10=530

c) 289 100=2.89

d) 783x1000=738000

e) 6.33 10 =0.633

f) 1.23 x 100=123

g) 99.34 100=0.934

h) 135 x 10=1350

i) 789 1000=0.789

j) 6.446 x 100=644.6

k) 4678.3 10=

l) 67.4x100= 6740467.83

tuesday multiplication and division.notebook

7

June 19, 2020

Which number is missing from each sum

a) 89 x = 8900

b) 7.46 = 0.0746

c) 5678 = 56.78

d) 0.466 x = 4.6

e) 8790 8.790=

Which number did we start with?a) x100 = 6.7

b) 10= 789c) x 10 = 0.09

d) 100= 9872

f) 100 = 45.3

tuesday multiplication and division.notebook

8

June 19, 2020

Which number is missing from each sum

a) 89 x = 8900

b) 7.46 = 0.0746

c) 5678 = 56.78

d) 0.466 x = 4.6

e) 8790 8.790=

Which number did we start with?a) x 100 = 6.7

b) 10= 789c) x 10 = 0.09

d) 100= 9872

f) 100 = 45.30

100

100

100

10

1000

0.067

7890

0.009

987200

4530

tuesday multiplication and division.notebook

9

June 19, 2020

Balance these statements: remember the equal sign means that both sides are equal. Answer on the next slide

a) 65 x 10 = 6500

b) 100 = 0.3 x 10

c) 567 x = 5670 x

d)7890 = x 10

tuesday multiplication and division.notebook

10

June 19, 2020

Balance these statements: remember the equal sign means that both sides are equal.

a) 65 x 10 = 6500

b) 100 = 0.3 x 10

c) 567 x = 5670 x

d)7890 = x 10

10

300

1000 10

100 7.89

tuesday multiplication and division.notebook

11

June 19, 2020

The exponent of a number says how many times to use the number in a multiplication.

Exponents

We also use index or power

102 This tells you how many times

the number is multiplied by itself..

This is 10 squared which is 10 x 10 which is 100

tuesday multiplication and division.notebook

12

June 19, 2020

210

310

410

10x10

10x10x1010x10x10x10

105

10x10x10x10x10

Match the long version to these powers: check on the next slide

tuesday multiplication and division.notebook

13

June 19, 2020

210

3 10 4

1010x10 10x10x10 10x10x10x10

10510x10x10x10x10

tuesday multiplication and division.notebook

14

June 19, 2020

210

310

41010 1

Complete these sums using one of the above

a) 5.63 / =

b) x 674 =

c) 103 x 9.2 =

d) 12346/ 10 =2

0.563

674000

tuesday multiplication and division.notebook

15

June 19, 2020

2

103 10

4

10

10 1

Complete these sums using one of the above

c) 103 x 9.2 =

d) 12346/ 10 =2

a) 5.63 / =

b) x 674 =

0.563

674000103

102

92000

123/46

Attachments

X10X100DIV10DIV100.pptx

0

0

1

6

0

1

6

0

1

6

6

1

Units/Ones

Tens

Hundreds

Tenths

Hundredths

Thousandths

Tens of Thousandths

x10

÷10

÷100

0

0

8

0

0

8

0

0

8

0

0

8

Units/Ones

Tens

Hundreds

Tenths

Hundredths

Thousandths

Tens of Thousandths

x10

÷10

÷100

Original Number

7

0

7

0

7

0

0

7

7

0

7

0

0

7

0

0

0

x10

x100

x1000

÷10

÷100

÷1000

Just think.

If you are going to do a ‘x’ / multiplication – is your answer going to get bigger or smaller?

BIGGER!

So if you are doing 4.5 x 10 –

Your answer cannot be 0.45 or 0.045 or 0.4

Because…

They are all SMALLER!

0

0

8

Next look at the number of zeros ( 0 )

If there is 2 0’s, your number is going to get 2 place values bigger or smaller.

If there is 6 0’s, your number is going to get 6 place values bigger or smaller.

Can you do 0.08 x 10 following these rules?

0

8

Can you do 0.8 x 1000 following these rules?

Try these on your whiteboard!

4 x 100

0.4 x 100

0.4 ÷ 10

900 ÷ 1000

SMART Notebook

Page 1: Jun 14-13:41Page 2: Jun 14-13:41Page 3: Jun 14-13:41Page 4: Jun 14-13:41Page 5: Jun 14-13:41Page 6: Jun 14-13:41Page 7: Jun 14-13:41Page 8: Jun 14-13:41Page 9: Jun 14-13:41Page 10: Jun 14-13:41Page 11: Jun 14-13:41Page 12: Jun 14-13:41Page 13: Jun 14-13:41Page 14: Jun 14-13:41Page 15: Jun 14-13:41