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# Suitable Accuracy

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by

## Mr Mattock

on 1 September 2018

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#### Transcript of Suitable Accuracy

Suitable Accuracy
Starter
A rectangle is 0.32 metres long by 0.86 metres wide.

(a) Calculate the area of the rectangle.

(c) Compare this to the number of significant figures in the original lengths. What does this suggest?
Key notes
Maximum number of significant Minimum number of
figures in an answer significant figures in the question
Round to a suitable accuracy
The speed of a car is displayed as 35 mph. The car travels for 3 hours 45 minutes. Work out the distance the car has travelled. Give your answer to a suitable degree of accuracy.
L.O. - Understand how measurements affect the appropriate accuracy that answers should be rounded to.
Starter
A rectangle is 0.32 metres long by 0.86 metres wide.

(a) Calculate the area of the rectangle.
0.2752 m

(c) Compare this to the number of significant figures in the original lengths. What does this suggest?
2
4
This is twice as many, which suggests it is too accurate.
<
A rectangle is 0.32 metres long by 0.86 metres wide.
Round to a suitable accuracy
The speed of a car is displayed as 35 mph. The car travels for 3 hours 45 minutes. Work out the distance the car has travelled. Give your answer to a suitable degree of accuracy.
Distance = speed x time
= 35 x 3.75
= 131.25
= 130 miles (2.s.f.)
Suitable Accuracy
Worked example
Worked
example

Key
examples

Plenary
Write down one sentence for

www. (what went well .com)

ebi (even better if)
Activities
Activity

Find the volume of this box. Give your answer to a suitable accuracy.
Suitable Accuracy
Find the volume of this box. Give your answer to a suitable accuracy.
2.9 x 2.2 x 2.8 = 17.864

18 cm
2
Main Activity 1
Complete the suitable accuracy worksheet.
Main Activity 1
Complete the suitable accuracy worksheet.
1). (a) 1.962631579
(b) 1.96 or 2.0

2). (a) 10 or 10
(b) 13
(c) 16
(d) 10 or 10
(e) 4.9

3) 473 mph

4) 400 or 400 metres
5) 43 or 40
Bright Spark:
Habib says the length of the river Thames is 300 km rounded to 1 significant figure.
Emma says the length of the river Thames is 350 km rounded to 2 significant figure.
Both are correct.
What values could the length of river Thames be to the nearest whole number.
Full transcript