Lesson 1: Length

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Metric Measuring

• Lesson 1 Length
• Lesson 2
• Mass

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An IntroductionTo the Metric Measuring System
of Length
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Metric Units
The Smallest unit of measurement in the metric
system is the Millimeter--the small and medium
lines.
It takes 10 Millimeters (mm) to make 1 Centimeter
(cm)
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Question 1How many Millimeters in one centimeter?
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Answer 1It takes 10 milimeters to make one
centimeter
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Metric Units
The Smallest unit of measurement in the metric
system is the is the Millimeter--the small and
medium lines.

It takes 10 Millimeters (mm) to make 1 Centimeter
(cm)
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Question 2What do you think the medium sized
lines measure?
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Metric Units
The medium lines are identified by the yellow
arrows
Answer
The medium lines break the centimeters into half
centimeters or 5-milimeter segments, they also
mark milimeters
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1-Centimeter (cm) 10-Milimeters (mm)
1-Milimeter There are 10 millimeters in 1
Centimeter
1-Centimeter The distance between the two arrows,
and the length of the yellow line.
CM
MM
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Question 3Which measurement is smaller one
millimeter or one centimeter?
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Answer 3The millimeter is smaller. It takes 10
millimeters to make one Centimeter
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Question 4How many Millimeters in one centimeter?
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Answer 4It takes 10 millimeters to make one
Centimeter?
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Reading Metric Measurements
For todays lesson you will mark the number of
centimeters followed by the millimeters and then
convert the millimeters into a decimal
Example for the blue line we count the
centimeters first.
The next thing we do is add the millimeters.
4cm
Can you identify the second measurement?
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Reading Metric Measurements
4cm
and 3 mm
The last step we do is to add the two together
and convert them into decimal form
4cm 3 mm 4.3 cm
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Reading Metric Measurements
You can say that one mm is equal to 1/10 th of a
cm. and we read it as a decimal 0.1
This measurement is 4 3/10 th cm - Or as a
decimal 4.3 cm
Can you identify the second measurement?
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Reading Metric Measurements
You can say that one mm is equal to 1/10 th of a
cm. and we read it as a decimal 0.1

Can you name the red arrows value in decimal form?
First add up the centimeters
6 centimeters
3 Millimeters
Second add up the millimeters
Finally we add them together and convert into
decimal form
6 cm 3 mm 6.3 cm
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Now!
For your lab, you must do the same three steps
for each of the measurements.

• Count the Centimeters first

2) Count the Millimeters second
3) And finally add them together and put them in
decimal form
10 centimeters 5 millimeters 10.5 centimeters
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Any Questions?
Go to work!