developing standard and metric measuring skills · metric (si) system 1. count the number of whole...
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Introduction to Measurement
Developing Standard and Metric
Measuring Skills
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Why Learn to Measure?
Valuable skill for a job
Valuable skill for hobbies
Valuable skill for every day life
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Measurement Systems
Two types of measurement systems exist.
– Standard (Customary)
- Metric (SI or International System)
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Standard (Customary) System
Inches Fractions
2
4
8
16
¼ ¾
The Whole Inch
First Half Second Half
1/8 3/8
5/8 7/8
1/16 3/16
5/16 7/16
9/16 11/16
13/16 15/16
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1. Find out how many parts the inches are divided into.
Count the spaces in 1 inch.
This number will be the denominator.
2. Count the number of whole inches.
Write down the number.
3. Count the number of spaces after the last whole inch.
This number will be the numerator.
4. Reduce fraction, if necessary.
Steps in Using the
Standard (Customary) System
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Step 1:
Step 2
Step 3:
Find Denominator
Count Whole Inches
Find Numerator
Step 4 Reduce Fraction, If Necessary
Let’s Review
16
7 1
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Let’s Practice
What is the distance from the end of the ruler to A?
What is the distance from the end of the ruler to E?
What is the distance from the end of the ruler to D?
What is the distance from the end of the ruler to C?
What is the distance from the end of the ruler to B?
¼ in.
15/16 in.
1 ¾ in.
2 3/8 in.
3 1/16 in.
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Metric System
International System of Units (SI)
Millimeters and
Centimeters Decimals
1 mm = 0.1 cm
5 mm = 0.5 cm
10 mm = 1 cm
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Steps in Using the
Metric (SI) System
1. Count the number of whole centimeters
(cm). These are the larger lines with numbers
2. Count the number of lines after the whole
number.
The smaller lines are millimeters (mm).
3. Put in correct terms.
Since mm are 1/10th of a cm, if you
measure 7 marks after 1 cm, the measure
is 1.7 cm or 17 mm long.
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Let’s Practice
What is the distance from the end of the ruler to A?
What is the distance from the end of the ruler to E?
What is the distance from the end of the ruler to D?
What is the distance from the end of the ruler to C?
What is the distance from the end of the ruler to B?
4 mm = 0.4 cm
19 mm = 1.9 cm
37 mm = 3.7 cm
63 mm = 6.3 cm
73 mm = 7.3 cm
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Converting from Standard to Metric
Convert from: To: Multiply by:
mile kilometer (km) 1.609347
inch millimeter (mm) 25.4
inch centimeter (cm) 2.54
foot meter (m) 0.3048
yard meter (m) 0.9144
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Converting from Metric to Standard
Convert from: To: Multiply by:
kilometer (km) mile 0.6214
millimeter (mm) inch 0.0394
centimeter (cm) inch 0.3937
meter (m) foot 3.281
meter (m) yard 1.094
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Let’s Practice You used a meter stick to measure
your window for new shades. However, the shade packages list the measurements in English units. Luckily your cell phone has a calculator so that you can quickly convert your 81.3 cm by 91.4 cm window opening to English units. What size is your window using English units? Round to the nearest inch.
81.3 x .3937 = 32 in.
91.4 x .3937 = 36 in.
Therefore, the window opening is 32 in. by 36 in.
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Image Resources
Microsoft, Inc. (2008). Clip Art. Retrieved October 7, 2008, from
http://office.microsoft.com/en-us/clipart/default.aspx