Why Learn to Measure?
Valuable skill for a job
Valuable skill for hobbies
Valuable skill for every day life
Measurement Systems
Two types of measurement systems exist.
– Standard (Customary)
- Metric (SI or International System)
Standard (Customary) System
Inches
Fractions
The Whole Inch
First Half
Second Half
¼
¾
1/
3/
5/
7/
8
8
8
8
2
4
8
1/
16
3/
16
5/
16
7/
16
9/
16
11/
16
13/
16
15/
16
16
Steps in Using the
Standard (Customary) System
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.
Let’s Review
1
Count Step
Whole
2 Inches
Find Step
Numerator
7 3
Find Step
Denominator
16 1
Reduce Fraction,
Step 4 If Necessary
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 B?
What is the distance from the end of the ruler to C?
What is the distance from the end of the ruler to D?
What is the distance from the end of the ruler to E?
¼ in.
15/16 in.
1 ¾ in.
2 3/8 in.
3 1/16 in.
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
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.
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 B?
What is the distance from the end of the ruler to C?
What is the distance from the end of the ruler to D?
What is the distance from the end of the ruler to E?
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
Converting from Standard to Metric
Convert from:
mile
inch
inch
foot
yard
To:
kilometer (km)
millimeter (mm)
centimeter (cm)
meter (m)
meter (m)
Multiply by:
1.609347
25.4
2.54
0.3048
0.9144
Converting from Metric to Standard
Convert from:
kilometer (km)
millimeter (mm)
centimeter (cm)
meter (m)
meter (m)
To:
mile
inch
inch
foot
yard
Multiply by:
0.6214
0.0394
0.3937
3.281
1.094
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.
Image Resources
Microsoft, Inc. (2008). Clip Art. Retrieved October 7, 2008, from
http://office.microsoft.com/en-us/clipart/default.aspx