# Limits of accuracy

In this lesson, we will learn how to find the upper and lower bounds of a rounded value and use this information in simple calculations

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
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.Round 128 to one significant figure.

1/5

Q2.Round 0.0030482 to two significant figures.

2/5

Q3.Round 476.8594 to three significant figures.

3/5

Q4.Which of the following cannot be rounded to 567 000?

4/5

Q5.A number has been rounded to 709 to three significant figures. Which is the only one of the following that could be that number?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
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.Round 128 to one significant figure.

1/5

Q2.Round 0.0030482 to two significant figures.

2/5

Q3.Round 476.8594 to three significant figures.

3/5

Q4.Which of the following cannot be rounded to 567 000?

4/5

Q5.A number has been rounded to 709 to three significant figures. Which is the only one of the following that could be that number?

5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Limits of accuracy

Find the upper and lower bound of a rounded value and use in simple calculations.

Q1.What is the upper bound of 21 cm rounded to the nearest centimetre?

1/5

Q2.The population of Yorkshire is 5 400 000 to two significant figures, what is the greatest possible number of people who live in Yorkshire?

2/5

Q3.What is the lower bound for 120, rounded to the nearest 5?

3/5

Q4.A rectangle has sides of 5.6 cm and 8.4 cm rounded to the nearest millimetre. What is the lower bound for the perimeter?

4/5

Q5.The side length of a square is rounded to the nearest tenth of a centimetre and used to calculate its area of 38.44 cm². What is the lower bound for the perimeter of the square?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Limits of accuracy

Find the upper and lower bound of a rounded value and use in simple calculations.

Q1.What is the upper bound of 21 cm rounded to the nearest centimetre?

1/5

Q2.The population of Yorkshire is 5 400 000 to two significant figures, what is the greatest possible number of people who live in Yorkshire?

2/5

Q3.What is the lower bound for 120, rounded to the nearest 5?

3/5

Q4.A rectangle has sides of 5.6 cm and 8.4 cm rounded to the nearest millimetre. What is the lower bound for the perimeter?

4/5

Q5.The side length of a square is rounded to the nearest tenth of a centimetre and used to calculate its area of 38.44 cm². What is the lower bound for the perimeter of the square?

5/5

# Lesson summary: Limits of accuracy

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga