Year 8

# Rounding to significant figures (Part 2)

## Slide deck

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## Lesson details

### Key learning points

- In this lesson, we will learn how to round decimal numbers to a given significant figure.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 6 Questions

Q1.

What does degree of accuracy mean?

How long a measurement is

How many decimal points in a number

Measurements only rounded to a given significant figure

Q2.

How many significant figures does 0.0045 have?

1 s.f.

4 s.f.

5 s.f.

Q3.

How many significant figures does 5610 have?

2 s.f.

4 s.f.

Q4.

Rounding 405.3 to the nearest integer is the same as rounding to ________ significant figures.

1 s.f

2 s.f

4 s.f

Q5.

Round 7906 to 3 s.f.

7900

7916

8000

Q6.

What does significant figure tell us?

How many non-zero digit in a number

Significant figure tell us how many numbers after the decimal point

### 6 Questions

Q1.

Round 0.0078 to 1 s.f.

0.008

1

1.0000

Q2.

Using a calculator or otherwise, work out the volume of a cube with length 6.5cm. Give your answer to 3 significant figures.

270

274

275.000

Q3.

Find the area of a rectangle with a base of 9.8 cm and a height of 4.8 cm. Give your answer to 3 s.f.

47

47.04

470

Q4.

Round 13490 to 2 s.f.

13

13.000

13400

Q5.

Calculate √45 correct to 3 s.f.

6.70

6.700

6.708

Q6.

Use your calculator to work out the value of:

4

4.0

5.0