8. Fill in this table. Decide first what units of measurement are most appropriate. Make your estimate. Measure to see how close you were. Calculate the difference between your estimate and the actual measurement. State what instrument you used to measure.


Object Unit


Height of the door


Width of the class


Thickness of a rubber


Length of the yard


Length of your pencil


Perimeter


Perimeter is a measure of the distance you would travel if you walked around the outside of a shape.


1. If a small snail slipped and slithered along the perimeter of this shape, how far would it have travelled?


8cm 5cm 7cm 11cm


2. Run your finger along the outside of your maths book. Now work out what distance your finger has travelled. Compare your answer with those of the people near you.


3. Work out the perimeters of these shapes. a)


c) 4mm 6mm 5mm b) 3km 7km 5km 2km 56cm 43cm 9cm Length 153 75cm d) 38cm 19cm 13cm


8cm 7cm


2cm 9cm 26cm Estimate Measurement Difference Instrument


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