Year 8

Year 8

# Rounding to significant figures (Part 2)

## Lesson details

### Key learning points

1. 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.

## Video

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## Worksheet

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## Starter quiz

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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
Correct answer: How precise a measure is, usually shown in the number of decimal places or significant digits
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
Correct answer: Significant figures are the number of digits in a value, often a measurement, that tells us the degree of accuracy of the value.

## Exit quiz

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### 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