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Relationship between Different units of Length

Besides these four units, that is, mm, cm, m and km, there are some more units of
length. Let us see these units and the relationships between them.

Every move to the right makes the unit 10 times smaller.

×10 ×10 ×10 ×10 ×10 ×10
kilometre hectometre decametre metre decimetre centimetre millimetre
(km) (hm) (dam) (m) (dm) (cm) (mm)

÷10 ÷10 ÷10 ÷10 ÷10 ÷10

Every move to the left makes the unit 10 times bigger.

To convert a higher ×1000 ×100 ×10 To convert a lower
unit into a lower unit, unit into a higher unit,
move towards the km m cm mm move towards the
right and multiply left and divide by
by 10, 100, 1000 10, 100, 1000
and so on. ÷1000 ÷100 ÷10 and so on.

Conversion using a Double number Line

Example 1. Complete the double number lines by filling in the missing numbers
appropriately.
× 5
___
1 cm 5 cm 15 cm cm 22 cm ___ cm 32 cm

× 10 × __

10 mm ___ mm ___ 180 ___ mm 270 mm ___ mm
mm mm
× __

Solution.
× 5
18
15 ___
1 cm 5 cm cm cm 22 cm ___ cm 32 cm
27
× 10 × __ 10 15 × 10 180 ÷ 10 22 × 10 270 ÷ 10 32 × 10

___ mm
___ mm
___ mm
10 mm 50 150 180 220 270 mm 320
___
mm mm
× __ 5

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Measurement