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Topic: Number, Fractions, Decimals, Percentage, Ratio and Proportion (Higher - Unit 3)

Specification References: N1.4h

N1.4h Approximate to specified or appropriate degrees of accuracy including a given number of decimal places and significant figures.


Candidates should be able to:

  • round to a given number of significant figures
  • round to a suitable degree of accuracy

Notes

This is part of the core number work required across all units. The core number work will be assessed so that it is linked to other specification references within this unit.

Candidates should know that some answers are inappropriate without some form of rounding, for example 4.2 buses.

Examples

  1. A right-angled triangle has two sides of length 3.4cm
    Work out the length of the third side.
    Give your answer to a suitable degree of accuracy.

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  1. The edges of a cuboid are measured to an accuracy of one decimal place.

Length = 5.3 cm; width = 4.2 cm; height = 7.0 cm

 

Calculate the volume.

Give your answer to a suitable degree of accuracy.

  1. In a right angled triangle ABC
    Angle A = 42°
    Angle B = 48°
    AB = 17 cm

        Work out the length of AC
        Give your answer to two significant figures.