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Brøk
Foto: EverJean
Brøk
• Brøk er et uttrykk for en eller flere
like store deler av en enhet.
• En brøk gir informasjon om hvor
mange deler du har brutt opp et helt
stykke i.
• En brøk forteller også noe om hvor
mange deler av et helt stykke du
har.
Hvor stor del av kaken er spist?
Hvor mye er igjen?
Brøk
• Vi skriver brøker med tre elementer.
• Disse er teller, brøkstrek og nevner.
Telleren står øverst. Den forteller om hvor mye av
enheten vi har.
Brøkstreken deler teller og nevner. Brøkstreken
er et deletegn.
Nevneren står nederst. Nevneren gir informasjon
om hvor mange deler enheten er oppdelt i.
Brøk
• Når telleren og nevneren er like stor, er det det samme som en hel.
Brøk
En kake er delt opp i fire like store deler.
Her har du fått tre firedeler.

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Brøk.pptx

  • 2. Brøk • Brøk er et uttrykk for en eller flere like store deler av en enhet. • En brøk gir informasjon om hvor mange deler du har brutt opp et helt stykke i. • En brøk forteller også noe om hvor mange deler av et helt stykke du har. Hvor stor del av kaken er spist? Hvor mye er igjen?
  • 3. Brøk • Vi skriver brøker med tre elementer. • Disse er teller, brøkstrek og nevner. Telleren står øverst. Den forteller om hvor mye av enheten vi har. Brøkstreken deler teller og nevner. Brøkstreken er et deletegn. Nevneren står nederst. Nevneren gir informasjon om hvor mange deler enheten er oppdelt i.
  • 4. Brøk • Når telleren og nevneren er like stor, er det det samme som en hel.
  • 5. Brøk En kake er delt opp i fire like store deler. Her har du fått tre firedeler.

Editor's Notes

  1. Brøk er et uttrykk for en eller flere like store deler av en enhet. Ordet brøk kommer fra det latinske fractus som betyr brudd. På engelsk heter brøk fraction. En brøk forteller noe om hvor mange deler av et helt stykke du har. Vi kan også si det slik at brøk gir informasjon om hvor mange deler du har brutt opp et helt stykke i. I en del tilfeller vil brøk være nyttig dersom man ønsker å beregne noe helt nøyaktig.
  2. Vi skriver brøker med de tre elementene teller, brøkstrek og nevner. Telleren, som står øverst, forteller om hvor mye av enheten vi har. Brøkstreken deler teller og nevner, og er et deletegn. Nevneren, som står nederst, gir informasjon om hvor mange deler enheten er oppdelt i. En liten huskeregel: Teller på toppen (TT), nevner nederst (NN).
  3. Når telleren er like stor som nevneren, er det det samme som en hel. Dette gjelder uansett hvor mange deler enheten er oppdelt i eller hvilken enhet det er vi har delt opp.
  4. Over har vi illustrert med en kake som er delt i fire like store deler. Hvis du får et stykke, har du ¼ av kaken. ¾ ligger igjen. Dersom du får to kakestykker, har du fått 2/4 og det samme ligger igjen på fatet. Tar du enda et stykke, har du tatt ¾, mens det bare ligger igjen ¼. Tar du også det siste stykket, har du tatt alle fire, 4/4. Hele kaken er spist av deg. Vi forstår med det at når teller er like stor som nevner, er det en hel.