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Fractions - zlomky

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7. RO N K Z KLADN KOLY Fractions One ninth We divide a whole into identical parts The picture is cut into 9 identical parts Dividing into quarters means to ... – PowerPoint PPT presentation

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Title: Fractions - zlomky


1
Fractions - zlomky
  • 7. ROCNÍK ZÁKLADNÍ ŠKOLY

2
Fractions
We divide a whole into identical parts
The picture is cut into 9 identical parts
One ninth
3
Fractions
How many parts is the picture divided into?
quarters
quarters
Dividing into quarters means to divide something
into four identical parts.
4
Fractions
  • A fraction is a part of a whole

5
Fractions
  • One Half
  • Draw it
  • One Quarter
  • Draw it
  • The top number tells us how many parts you have
    and the bottom number tells us how many parts the
    whole was divided into

6
Expanding Fractions
Expanding a fraction by a number different from 0
means multiplying the numerator and also the
denominator by this number.
The value of the fraction is the same!
Equivalent fraction
We divided each part into 2 parts only.
7
Expanding Fractions
Expanding by the number 2 (dividing a sheet of
paper)
8
Expanding Fractions
Expand fractions by the number 4
9
Count on the interactive board
Expand fractions by the number 3
Expand fractions by the number 5
10
Cancelling Fractions
Cancelling a fraction means dividing the top
number (numerator) and the bottom number
(denominator) by the common factor.
The value of the fraction is the same!
Equivalent fraction
11
Cancelling Fractions
Cancel fractions by the number 4
12
Count on the interactive board
Cancel fractions by the number 3
Cancel fractions by the number 5
13
Try it yourself!
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