# Estimating answers

Approximate the answer to a calculation by rounding all the values to one significant figure before calculating

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!

## Question 5

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

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!

## Question 5

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

# 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.

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:

# Estimating answers

Estimate answers to calculations by rounding numbers to one significant figure before calculating.

## Question 5

Q1.Which calculation would we do to estimate the answer to 467 ÷ 0.48?

1/5

Q2.2. Estimate the answer to 34 x 890

2/5

Q3.3. Estimate the answer to 273 ÷ (0.64 + 0.853)

3/5

Q4.Which of the following calculations would have as estimated answer of 1000?

4/5

Q5.5. Would the estimate for 743 x 3299 be an overestimate or an underestimate?

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:

# Estimating answers

Estimate answers to calculations by rounding numbers to one significant figure before calculating.

## Question 5

Q1.Which calculation would we do to estimate the answer to 467 ÷ 0.48?

1/5

Q2.2. Estimate the answer to 34 x 890

2/5

Q3.3. Estimate the answer to 273 ÷ (0.64 + 0.853)

3/5

Q4.Which of the following calculations would have as estimated answer of 1000?

4/5

Q5.5. Would the estimate for 743 x 3299 be an overestimate or an underestimate?

5/5

# Lesson summary: Estimating answers

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### Time to move!

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

For 5 mins...

Move around:
Jog

On the spot:
Dance

### Take part in The Big Ask.

The Children's Commissioner for England wants to know what matters to young people.

Share your views and have your voice heard.

This was the final lesson in the unit Rounding and Estimating.