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In Course: GCSE Mathematics: Lower Tier

GCSE Maths: Percentages of Amounts

Learn how to calculate percentages of quantities, both with and without a calculator. This deck covers finding percentages using building blocks like 10% and 1%, using decimal multipliers with a calculator, and how to express one quantity as a percentage of another.

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Deck Contents

26 Cards
Lesson#1
Welcome to this deck on percentages of amounts. A percentage is just a special type of fraction, meaning 'out of one hundred'. In this deck, we'll cover three key skills. First, how to find a percentage of an amount without a calculator. Second, how to do it with a calculator. And third, how to express one number as a percentage of another.
Lesson#2
Let's start with non-calculator methods. The trick is to use easy percentages as building blocks. The most useful ones are 50 percent, 10 percent, and 1 percent, because they are easy to find from any starting amount.
Quiz#3
To find 50 percent of an amount, what simple calculation can you do?

halve it

Quiz#4
To find 10 percent of an amount, what number do you divide by?

10

Quiz#5
To find 1 percent of an amount, what number do you divide by?

100

Lesson#6
Now we can use these building blocks. To find 5 percent of an amount, you can first find 10 percent, and then halve that answer. For example, to find 5 percent of 80, you first find 10 percent, which is 8. Then you halve 8 to get 4. So, 5 percent of 80 is 4.

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