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### The Metric System

Warm up 8/30/07

- What did you discover from yesterday’s lab?
- Find the volume of the object in cm³ and mL

2 cm

5 cm

2 cm

Announcements

- If you were absent be sure to check the grey folder in absent work bin to get stuff missed
- If you leave anything here, it will be in the work passes back bin
- If you bring in pennies before 1982 you will receive a no homework pass.
- 1 penny = 5 pt homework pass

In science class, we will be using the METRIC SYSTEM.

We use different measurements depending on how big or small and object is-

For example, you would use centimeters to measure a coin, and kilometers to measure the distance from San Marcos to Escondido.

We can change the standard unit using

pre-fixes

The prefixes are (from largest to smallest)

- Kilo- K
- Hecto- H
- Deka- D
- Unit- Meter, Liter or Gram
- Deci- d
- Centi- c
- Milli- m

Pre-fixes

We can think of the prefixes like a stair step

Kilo

1000

Hecto

100

Deka

10

UNIT

Liter

Meter

Gram

1

Deci

1/10

Centi

1/100

Milli

1/1000

Converting

When you go down the stair to the right, you move the decimal over that many spaces in the same direction.

For example: convert 5.5 Dl to cl

K H D U D C M

5

5

3 spaces moved to the right, so move decimal point 3 to the right

5,500 cl

Let’s try another

Convert .77 cg to kg

K H D U D C M

0

0

77

0

0

0

5 spaces to the left, so move decimal point 5 to the left

.0000077 kg

Your turn!

Convert 25 cm to Dm

K H D U D C M

0

2 5

3 spaces to the left, so move decimal point 3 to left

ANSWER: .025 Dm

Kilo

Hecto

Deka

Unit

deci

centi

milli

Converting SI UnitsIf you move down the stair step, you move the decimal to the right…

2.6 km = _260,000_ cm

2.6 km = _________ cm

If you move up the stair step, you move the decimal to the left

3,700 mm = ______ m

3,700 mm = __3.7__ m

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