Page 8 - Length
P. 8
6. (a) What is the length of this grey bar in millimetres?
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(b) What is the length of the grey bar in centimetres?
We can also record the length of an object with a combination of
two different units. The length of the grey bar in question 6 can
1
be given as 5 cm and 5 mm, or 5 cm.
2
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The bar above is more than 5 cm but less than 6 cm long.
It is 7 mm longer than 5 cm. We can therefore say that the bar is
5 cm and 7 mm. Or we can record it as 57 mm.
7. Discuss with one or two classmates why we can also record the
length of the purple bar as 57 mm.
8. First estimate the centimetre length of each of the bars on the
next page. Then measure each bar with your ruler. Complete
this table.
Bar Estimated length Measured length
Red
Blue
Purple
Light green
Dark green
Grey
7
