1. Starter: Percentage of amounts Starter: Percentage of amounts
Use a calculator to work out:
a) 77% of 82 =
b) 18% of 41 =
c) 0.36 x 45 =
d) 8% of 34 =
e) x 19 =
f) 0.23 x 40 =
g) 1.5% of 62
h) of 62
Which percentage of 62 are we working out in the last question?
Starter: Percentage of amounts
Use a calculator to work out:
a) 77% of 82 =
b) 18% of 41 =
c) 0.36 x 45 =
d) 8% of 34 =
e) x 19 =
f) 0.23 x 40 =
g) 1.5% of 62
h) of 62
Which percentage of 62 are we working out in the last question?

2. Percentage Increase and Decrease
Monday, 13 May 2019
Percentage Increase and Decrease
Calculate a percentage increase Calculate a percentage decrease

3. Percentage increase and decrease
With a calculator this skill relies on use of multipliers
Increase 340 by 14.5%
Decrease 275 by 12.5%
Thinking ahead: Instagram went from 200 million users to 400 million users, is this an increase of 200%?

4. Try One: Percentage increase and decrease
With a calculator this skill relies on use of multipliers
Increase 340 by 3%
Decrease 275 by 17%
Thinking ahead: Instagram went from 200 million users to 400 million users, is this an increase of 200%?

6. Convince me that the multiplier for a 150% increase is 2.5,not 1.5.
And Finally…
Convince me that the multiplier for a 150% increase is 2.5,not 1.5.
Jenny thinks that increasing an amount by 200% is the same as multiplying by 3. Do you agree with Jenny? Explain your answer.
Adeel thinks that we decrease an amount by 40% by multiplying by Is he correct?

8. What is this infographic showing us?
Why are there different numbers for each social media site?
Are there 400 hours of video uploaded to youtube each year?
Higher Order Thinking:
Who uses this information?
Note: 2.46million = 2,460,000
(6 places between the 2 and the decimal)

10. What is this infographic showing us?
Which App store is more popular? Apple or Android?
How many Twitter accounts would be created in 10 seconds?
How would we work out how often a new post is made on Facebook?

11. Social Media Standard Form
Monday, 13 May 2019
Social Media Standard Form
Convert from standard form to small ordinary numbers Represent small ordinary numbers in standard form

12. Write the answers to the following questions in standard form
The increase in the
The number of Facebook posts in 2014
The number of Instagram photos uploaded in 2014
The number of Tweets made in 2015
The number of google searches made in 2014
Write the answers to the following questions in standard form
The number of hours of video is uploaded to Youtube every seconds in 2015.
The number of Facebook posts every 60 seconds in 2014
The number of Instagram photos uploaded every 60 seconds in 2014
The number of Tweets made every 60 seconds in 2015
The number of google searches made every 60 seconds in 2014