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Units of length: meter and millimeter

We already know the centimeter and decimeter. Now let us meet the meter (m) and millimeter (mm). How the units fit together: • 1 cm=10 mm1\ \text{cm} = 10\ \text{mm} — one centimeter has ten millimeters. • 1 dm=10 cm1\ \text{dm} = 10\ \text{cm} — one decimeter has ten centimeters. • 1 m=100 cm1\ \text{m} = 100\ \text{cm} — one meter has one hundred centimeters. • 1 m=10 dm1\ \text{m} = 10\ \text{dm} — one meter has ten decimeters. We use meters for longer lengths: a person’s height, the width of a room, the length of a road. A millimeter is a very small unit: good for talking about the thickness of a sheet of paper or a pencil.
1 m=100 cm=10 dm1\ \text{m} = 100\ \text{cm} = 10\ \text{dm}
1 cm=10 mm1\ \text{cm} = 10\ \text{mm}
1 dm=10 cm1\ \text{dm} = 10\ \text{cm}
Meter — for longer distances; millimeter — for very small ones
Length unit conversion table
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