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Units of Measurement
Whole Numbers (1, 2, 3)
Fractions (1/8”)
Decimals (0.392)
Metric (1 mm)
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Introduction
British Imperial System
(U.S.)
Metric System
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British System
Fractions (rulers)
Inches
Feet
yards
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Fractions
A fraction is a number that
expresses part of a group.
Fractions are written in the
form of a/b, where a and b
are whole numbers, and the
number b is not 0.
The number a is called the
numerator, and the number b
is called the denominator.
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Example
The fraction 4/6 represents the
shaded portion of the circle
below. There are 6 pieces in the
group, and 4 of them are shaded.
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Example #2
The fraction 3/8 represents the
shaded portion of the circle
below. There are 8 pieces in the
group, and 3 of them are shaded.
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Some Rules
Always reduce the
fraction to the lowest
common denominator.
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Questions
Any questions on what a
fractions is?
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Fractions on Rulers
Top = metric
Bottom = fractions
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Ruler divisions
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Ruler divisions
Rulers can be divided into:
1/2
1/4
1/16 1/32
1/8
1/64
Always reduce the fraction
to the lowest common
denominator
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Ruler fractions
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Put it all together
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Questions
Questions on fractions or
rulers?
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Fractions Quiz
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Answers
A – 8ths
B – 1”
C – 1/2”
D – 1/4”
E – 1/8”
F - 16ths
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G – 1/8”
H – 1/8”
I – 1/16”
J – 1/32”
K – 1/64