Fractions - zlomky 7. ROČNÍK ZÁKLADNÍ ŠKOLY.

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Presentation transcript:

Fractions - zlomky 7. ROČNÍK ZÁKLADNÍ ŠKOLY

Fractions We divide a whole into identical parts One ninth The picture is cut into 9 identical parts One ninth vlastní obrázek autora prezentace, vytvořen v GIMPu

Fractions How many parts is the picture divided into? quarters zdroj obrázku: http://pdphoto.org/PictureDetail.php?mat=&pg=5470 Dividing into quarters means to divide something into four identical parts.

Fractions DENOMINATOR A fraction is a part of a whole NUMERATOR FRACTION LINE Obrázek: vlastní kresba DENOMINATOR

Fractions One Half One Quarter 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

Expanding Fractions Expanding a fraction by a number different from 0 means multiplying the numerator and also the denominator by this number. The fraction expands by 2 Obrázek: vlastní kresba The value of the fraction is the same! = Equivalent fraction We divided each part into 2 parts only.

Expanding Fractions Expanding by the number 2 (dividing a sheet of paper) Obrázek: vlastní kresba

Expanding Fractions Expand fractions by the number 4 Obrázek: vlastní kresba

Count on the interactive board Expand fractions by the number 3 Expand fractions by the number 5 Obrázek: vlastní kresba

Cancelling Fractions Cancelling a fraction means dividing the top number (numerator) and the bottom number (denominator) by the common factor. The fraction cancelled by 2 Obrázek: vlastní kresba The value of the fraction is the same! = Equivalent fraction

Cancelling Fractions Cancel fractions by the number 4 Obrázek: vlastní kresba

Count on the interactive board Cancel fractions by the number 3 Cancel fractions by the number 5 Obrázek: vlastní kresba

Try it yourself!