Year 8

Rounding to significant figures (Part 1)

Year 8

Rounding to significant figures (Part 1)

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Lesson details

Key learning points

  1. In this lesson, we will be introduced to significant figures and understand the concept of degrees of accuracy. We will also learn how to round whole numbers to a given significant figure.

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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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6 Questions

Q1.
What does this symbol mean? ≈
Correct answer: Approximately equal to
Closely linked to
Equal to
Not equal to
Q2.
Find an approximation for:
An image in a quiz
18
Correct answer: 25
27
27.3
Q3.
A student is thinking of an approximate value for √(67 ). What should her answer be?
2√(17) because that is the answer my calculator gives
Correct answer: 8 because √(64) is 8
8.24 because that is the exact answer to 2 d.p.
9 because 67 is closer to 70
Q4.
Find an approximation for:
An image in a quiz
Correct answer: 10
10.5
15
22.5
Q5.
Find an approximation for:
An image in a quiz
25
44
55.7
Correct answer: 60
Q6.
Why is the approximation to this calculation greater than the actual answer?
An image in a quiz
Carlos approximate answer is wrong.
Carlos rounded down when he was approximating
Correct answer: Carlos rounded up for when approximating

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.
Correct answer: 2 s.f.
4 s.f.
5 s.f.
Q3.
How many significant figures does 5610 have?
2 s.f.
Correct answer: 3 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
Correct answer: 3 s.f
4 s.f
Q5.
Round 7906 to 3 s.f.
7900
Correct answer: 7910
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.