Warm up 8/30/07

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Warm up 8/30/07. What did you discover from yesterday’s lab? Find the volume of the object in cm ³ 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

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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

The Metric System

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

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

K H D U D C M

King Henry Died Unusually Drinking Chocolate Milk

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

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

Convert 12.6 km to dm

K H D U D C M

4 spaces to right = 126,000 dm

12 6

0

0

0

Kilo

Hecto

Deka

Unit

deci

centi

milli

Converting SI Units

If 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