Week 9 Numeracy
Parents - please don't feel the need to print all of the documents on this page - encourage your children to complete them in their books. This will save on your ink and give our pupils practice in setting out their work neatly - don't forget the date!
This week we are going to revise all that we know about percentages The word ‘percent’ means ‘out of 100’. Percentages are represented and identified by this sign: % Percentages will be an important topic for you in Year 8, therefore it's a good idea to do some revision of them before the end of the year.
Percentages are linked closely with your fractions. It is vital that you know your fraction/percentage/decimal equivalents. The document below shows you the main equivalents – you need to know these off by heart.
Here are some activities and games that will help you revise your equivalents:
Finding the Missing Percentage
A list of percentages must always equal 100. Take a look at the example below that tells you the percentage time that Wilfred spent on his schoolwork.
To calculate how much time is spent on art, simply add up the percentages that you do know. In this case, they add up to 75%. This then is taken away from 100 to give you the answer. Therefore, Wilfred spends 25% of his time on art.
Complete the two pages below on finding the missing percent.
Percentages of Amounts.
To find a percentage of an amount, you need to know the following:
Here’s an example:
Find 75% of £30.
75% is equivalent to 3/4.
Step 1 – divide £30 by 4 = £7.50
Step 2 – multiply £7.50 by 3 = £22.50
Therefore: 75% of £30 = £22.50
These links will help you to practice finding percentages of amounts:
Here are some pages for you to practice in your books. Take care with your tables and show your working out (that's an order!!)
Now that you can calculate percentages of amounts, you can now happily proceed using percentages in word problems. We know that you all enjoy word problem solving, but remember your rucsac:
Some of these questions have two parts. You must remember to do all parts of the question. Here’s an example.
In 2020, Ipswich Town scored 90 goals. In 2021, they scored 10% more.
90 divided by 10 = 9
90 + 9 = 99
There are some problem solving activities for you to complete below.
Parents - these get progressively more difficult. Choose the task that is best for your child.
Use your knowledge of percentages to solve the following investigation called ‘Sale of the Century’. In class you often complete investigations in groups – you have our express permission to work collaboratively with someone at home for this (you might have to teach your parents about percentages first though!)
There are 3 versions of this investigation – they get progressively more challenging. Have a look at the numbers involved and choose investigation most appropriate to your child.