Limits of accuracy
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Lesson details
Key learning points
- 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
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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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5 Questions
Q1.
Round 128 to one significant figure.
120
128.0
130
Q2.
Round 0.0030482 to two significant figures.
0.00
0.003048
0.31
Q3.
Round 476.8594 to three significant figures.
476.859
480
7
Q4.
Which of the following cannot be rounded to 567 000?
566 900
567 009
567 065
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?
7.089
708.49
710.1
5 Questions
Q1.
What is the upper bound of 21 cm rounded to the nearest centimetre?
20.5 cm
21.4 cm
21.49 cm
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?
5 400 500
5 450 000
5 500 000
Q3.
What is the lower bound for 120, rounded to the nearest 5?
115
115.5
119.5
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?
13.9 cm
14.1 cm
28.2 cm
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?
6.15 cm
6.2 cm
9.61 cm