Year 8
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Lesson details
Key learning points
- 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.
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 this symbol mean? ≈
Closely linked to
Equal to
Not equal to
Q2.
Find an approximation for:
18
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
8.24 because that is the exact answer to 2 d.p.
9 because 67 is closer to 70
Q4.
Find an approximation for:
10.5
15
22.5
Q5.
Find an approximation for:
25
44
55.7
Q6.
Why is the approximation to this calculation greater than the actual answer?
Carlos approximate answer is wrong.
Carlos rounded down when he was approximating
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