Maths

Exit Lesson

Finding 100%

In this lesson, we will learn about how useful 100% is, and how we use it to solve various percentage problems.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.If the amount of flour in a bag increased by 20%, it would always mean we add 20g on to the amount.

1/5

Q2.If I increase 200kg by 30%, then the new amount I have is...

2/5

Q3.The decimal multiplier to increase an amount by 53% would be...

3/5

Q4.It is possible to increase an amount by more than 100%

4/5

Q5.If you decreased an amount by 60%, the decimal multiplier would be 1.60.

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.If the amount of flour in a bag increased by 20%, it would always mean we add 20g on to the amount.

1/5

Q2.If I increase 200kg by 30%, then the new amount I have is...

2/5

Q3.The decimal multiplier to increase an amount by 53% would be...

3/5

Q4.It is possible to increase an amount by more than 100%

4/5

Q5.If you decreased an amount by 60%, the decimal multiplier would be 1.60.

5/5

Video

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Worksheet

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Finding 100%

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.If 75% of a number is 150, what is my number?

1/5

Q2.If I buy a car in a 20% off sale and it costs £30,000, how much did the car originally cost?

2/5

Q3.If I decreased the amount I paid for my car insurance by 90% to £36.50 per year, how much did I pay previously for my car insurance?

3/5

Q4.If a jumper was marked as 56% off and costs £50 now, then 44% of the original cost of the jumper is equal to £50

4/5

Q5.If I know something costs £2.10 in a 30% off sale, then I would calculate £2.10 = 70% and scale accordingly to get that 100% = £3 to find the original amount.

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Finding 100%

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.If 75% of a number is 150, what is my number?

1/5

Q2.If I buy a car in a 20% off sale and it costs £30,000, how much did the car originally cost?

2/5

Q3.If I decreased the amount I paid for my car insurance by 90% to £36.50 per year, how much did I pay previously for my car insurance?

3/5

Q4.If a jumper was marked as 56% off and costs £50 now, then 44% of the original cost of the jumper is equal to £50

4/5

Q5.If I know something costs £2.10 in a 30% off sale, then I would calculate £2.10 = 70% and scale accordingly to get that 100% = £3 to find the original amount.

5/5

Lesson summary: Finding 100%

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The next lesson in:
Growth and decay
is:
Repeated percentage change

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