Fractions - TeacherWeb

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Transcript Fractions - TeacherWeb

Identifying and Modeling
Fractions
Pamela D. Coleman
What is a fraction?
• A fraction represents
a part of a whole or
part of a set.
• Example:
The pizza slice is one
part of the whole
pizza.
2
Fractions
• There are two
numbers in a fraction.
1
The top number is
called the numerator.
2
The bottom number is
called the
denominator.
TIP: The Denominator is Downstairs
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Fractions
1
2
• The numerator tells
how many parts of the
whole or set you
have.
• The denominator tells
how many parts the
whole or set is divided
into.
4
Example
• The circle is divided
into 4 equal parts, or
fourths.
1
2
1
4
• Each part is one-fourth
of the whole circle - one
part out of four parts in
all.
• Two parts out of four
parts would be…
Two-fourths or one half
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Example
• The window is divided
into 2 equal parts, or
halves.
1/2
• Each part is one half
of the whole window one part out of two
parts in all.
• Two parts out of two
parts would be…
One whole or 2/2 or 1
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Numerator –
tells how many
parts of the
whole you have
Part of a
whole
Top number
is the
numerator
Denominator –
how many parts
the whole is
divided into
Bottom
number is the
denominator
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Practice...
• What fraction of
the pizza has
pepperoni on it?
• Hint: How many slices
have pepperoni on them?
3
• Hint: How many slices are
there in all?
4
• What fraction of the pizza
has pepperoni on it?
• ¾ (three-fourths)
That’s correct!
Let’s play a game!
More practice…
• What fraction of the teddy bears
is not brown?
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References
• http://www.kidsnumbers.com/turkeyterminator-math-game.php
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Other helpful math
websites…
• http://www.mathplayground.com/games
.html
• http://www.iknowthat.com/com/L3?Area
=L2_Math
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Thank you!
12
Correct!
3
5
Three - fifths
Back
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Oops…let’s try again…
Back
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