Estimating answers

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

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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.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!

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

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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:

Estimating answers

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

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.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.

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.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!

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For 5 mins...

Move around:
Jog

On the spot:
Chair yoga

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

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