Page 48 - SPARK OF MATH book 5

(3-1) Metric Units.
(3-1) Metric Units.

We use centimeter (cm) to measure the length of a

pencil, the width of a book etc. But this unit is too big to
measure the thickness of a pencil. So we use another unit
called millimeter (mm).

We use another unit called meters (m).
to measure the length of the classroom.

Even meter is too small of a unit when we
state the distance between two cities,
there we need kilometers (km).

Review the sizes of millimeters, centimeters, meters, and

kilometers and how to convert between them.

Kilometer Meter Decimeter Centimeter Millimeter

km m dm cm mm

1 1000 10,000 100,000 1,000,000

1
1 10 100 1000
1000

1 1
1 10 100
10,000 10

1 1 1
1 10
100,000 100 10

× ×
Since 1 km= 1000 m, then 7 km= 7000 m (7 1000= 7000)

÷ ÷
Since 1 m= 100 cm, then 500 cm= 5 m (500 100= 5)

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