New Prefixes for the DictionaryNew Prefixes for the Dictionary

Prefix Meaning Example

Milli 1/1000 millimeter

Centi 1/100 Centimeter

Deci 1/10 Decimeter

Deka 10x Dekameter

Heka 100x Hekameter

Kilo 1000x Kilometer

Learning TargetLearning Target

• I will collaborate with my table and class and learn how to use the chart to convert within the metric system.

Class ChallengeClass Challenge

• Everyone scores 3 out of 3 –

• It never has happened before.

• Doesn’t mean it can’t happen now!

You need scratch paper today:You need scratch paper today:

• There are 1000 meters in a kilometer. How many meters are there in 6.62 kilometers?

• There are 1/1000 meters in a millimeter. How many millimeters are there in 3 kilometers?

Far Side – Sort OfFar Side – Sort Of

Announcements:Announcements:

• 1) Video homework will be accepted late, but looks bad on progress report.

• 2) Look for a project over break! The more you share with me, the better your chances.

• 3) Quiz retakes after school Thursday, 10/17. Meeting today – can’t do it.

MeasuringMeasuring

What are three things we can What are three things we can measure?measure?

• #1 – Weight (Mass)• We use “grams”• #2 – Volume• We use “liters.”• #3 – Distance• We use “meters.”

Converting within the Converting within the Metric SystemMetric System

Its as easy as moving the decimal Its as easy as moving the decimal point.point.

The Table is the KeyThe Table is the Key

7

Kilo

6

Heka

5

Deka

4 3

Deci

2

Centi

1

Milli

1000x 100x 10x 1x 1/10x 1/100x

1/

1000x

K H Da No Prefix

D C M

For Example:For Example:

• I want to convert 3 KILOMETERS to MILIMETERS.

• Grab your table and let’s begin.

Answer the Following:Answer the Following:

• Which number is kilo?

• Which number is mili?

• What is the difference between the two?

• 7 (kilo) – 1 (mili) = 6

• WE WILL MOVE THE DECIMAL 6 PLACES!

• (But, in which direction?)

If we move between Kilo and Mili If we move between Kilo and Mili on the table…..on the table…..

• In which direction are we moving?

• Right or left?

• RIGHT

• We will move the decimal SIX places to the RIGHT.

SummarySummary

• 3 Kilometers =• 3000000 milimeters• A very long road!

The instructions written on The instructions written on your chartyour chart

1) Write down the number for the 1) Write down the number for the first prefixfirst prefix

2) Write down the number for the 2) Write down the number for the second prefixsecond prefix

3) Subtract the two numbers3) Subtract the two numbers

4) Determine which direction you 4) Determine which direction you move on the table between the move on the table between the

twotwo

5) Move the decimal5) Move the decimal

Another ProblemAnother Problem

I want to convert 3 dl to 3 hl

What is the first number?

What is the last number?

What is the difference between the two?

• 6 – 3 = 3!

• Which direction?

• Left

Summary:Summary:

• 3 deciliters = .003 hekaliters

WARNINGSWARNINGS

• If there is NO PREFIX, this means we are talking about #4 on the table.

• If there is one letter, that means that we are talking about #4 on the table.

• One M ALONE stands for Meter – not Mili!

• When moving to the left, if there are no more numbers, you need to include a zero for each space you need to move.

Practice ProblemsPractice Problems

50 meters = ???? Km

2.3 mL = ???? cL

.001 hg = ???? g

Practice problems

• 4) 84 dg = _______ cg

• 5) 100 L = __________ Kl

• 6) 82.34 hm = __________ m

• 7) 16.1 mm = __________ hm

Answers:

• 4) 840 cg

• 5) .1 KL

• 6) 8234 m

• 7) .000161 hm