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Add, subtract, multiply and divide numerical fractions.

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Regn ut og skriv svaret som en brøk eller et helt tall (ikke desimaltall). Bruk  / som brøkstrek, f.eks skrives $\\frac{2}{3}$ som 2/3. Prøv å forkorte svaret mest mulig.

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Learn from your mistakes and have another attempt by clicking on 'Try another question like this one' until you get full marks.

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$\\displaystyle\\frac{\\var{a}}{\\var{b}}+\\frac{\\var{c}}{\\var{b}}=$[[0]]

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$\\displaystyle\\frac{\\var{d}}{\\var{c}}-\\frac{\\var{a}}{\\var{c}}=$[[1]]

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Legg sammen tellerne, la nevneren stå.

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Disse brøkene har samme nevner. Det betyr at de hører til samme type oppdeling, og er derfor både lett å sammenligne og lett å regne med. Det er f.eks. lett å se att $\\frac{2}{3}$ er mindre enn $\\frac{5}{3}$ , to er jo mindre enn fem.

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Det er ikke like lett å se at f.eks. $\\frac{3}{5}$ er mindre enn $\\frac{2}{3}$, det er ikke så lett å sammenligne tredeler og femdeler.

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Anta at du skal regne sammen $\\frac{2}{3}+\\frac{5}{3}$, altså 'to tredjedeler plus fem tredjedeler', da har du til sammen syv tredjedeler.Slik skriver vi:

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\\[\\frac{2}{3}+\\frac{5}{3}=\\frac{2+5}{3}=\\frac{7}{3}\\]

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Samme gjelder for subtraksjon. Anta at du har syv fjerdedeler og må gi fra deg tre av dem. Da står du igjen med 7-3=4 fjerdedeler, altså en hel. 

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Vi skriver:

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\\[\\frac{7}{4}-\\frac{3}{4}=\\frac{7-3}{4}=\\frac{4}{4}=1\\]

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$\\displaystyle\\simplify{{f}/{g}+{h}/{j}}=$[[0]]

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$\\displaystyle\\simplify{{h}/{f}-{j}/{g}}=$[[1]]

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$\\displaystyle \\frac{\\var{a}}{\\var{d}}+\\var{f}=$[[2]]

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Finn fellesnevner før du adderer eller subtraherer.

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Eksempel: Hvis vi skal regne ut $\\frac{5}{4}+\\frac{3}{8}$ kan vi utvide den første brøken til $\\frac{10}{8}$ ved å multiplisere teller og nevner med 2. Da vil begge brøkene ha felles faktor 8, og vi kan regne sammen.

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Vi skriver slik:

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\\[\\frac{5}{4}+\\frac{3}{8}=\\frac{5\\cdot 2}{4\\cdot 2}+\\frac{3}{8}=\\frac{10}{8}+\\frac{3}{8}=\\frac{13}{8}\\]

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Ofte må begge brøkene skrives om, f.eks. i regnestykket $\\frac{5}{4}-\\frac{2}{3}$. Her kan vi multiplisere den første brøken med 3 over og under brøkstrek, og den andre med 4 over og under brøkstrek, slik at begge får 12 som nevner. Så kan vi subtrahere:

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\\[\\frac{5}{4}-\\frac{2}{3}=\\frac{5\\cdot 3}{4\\cdot 3}-\\frac{2\\cdot 4}{3\\cdot 4}=\\frac{15}{12}-\\frac{8}{12}=\\frac{7}{12}\\]

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Husk også at vi kan gjøre hele tall om til brøker for å lettere bruke reglene. F. eks er  $3=\\frac{3}{1}$.

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$\\displaystyle\\frac{\\var{a}}{\\var{b}}\\cdot \\frac{\\var{c}}{\\var{d}}=$[[0]]

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$\\displaystyle -\\frac{\\var{f}}{\\var{j}}\\cdot \\var{d}=$[[1]]

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Multipliser teller med teller og nevner med nevner.

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Eksempel: 

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\\[\\frac{4}{5}\\cdot \\frac{2}{3}=\\frac{4\\cdot 2}{5 \\cdot 3}=\\frac{8}{15}\\]

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Husk også at et helt tall er det samme som en brøk med nevner 1, f.eks er $7=\\frac{7}{1}$.

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$\\displaystyle \\frac{\\var{f}}{\\var{h}}: \\frac{\\var{g}}{\\var{j}}=$[[0]]

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$\\displaystyle \\frac{\\var{b}}{\\var{c}}: \\var{d}=$[[1]]

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$\\displaystyle \\var{j}: \\left(\\frac{\\var{-d}}{\\var{f}}\\right)=$[[2]]

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Når vi dividerer to brøker, kan vi regne ut ved å i stedet multiplisere med den omvendte brøken.

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Når vi skal dele på et helt tall, multipliserer vi med det omvendte tallet. Da skriver vi heltallet som en brøk med 1 i nevner, f.eks. er $6=\\frac{6}{1}$, og det omvendte tallet til 6 blir da $\\frac{1}{6}$

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Hvordan finner man f.eks halvparten av en brøk? Man kan \"dele på to\", eller man kan multiplisere med det omvendte tallet, nemlig $\\frac{1}{2}$.

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Anta at du skal regne ut $\\frac{3}{7}\\div\\frac{5}{4}$. Det er ikke så lett å se for seg hvor mange \"$\\frac{5}{4}$\" man kan dele $\\frac{3}{7}$\" opp i! Da er det lettere å multiplisere med $\\frac{4}{5}$.

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Vi kan skrive slik:

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\\[\\frac{3}{7}:\\frac{5}{4}=\\frac{3}{7}\\cdot\\frac{4}{5}=\\frac{3\\cdot 4}{7\\cdot 5}=\\frac{12}{35}\\]

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$\\displaystyle \\frac{\\frac{\\var{b}}{\\var{c}}}{ \\frac{\\var{a}}{\\var{d}}}=$[[0]]

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$\\displaystyle \\frac{\\frac{\\var{d}}{\\var{g}}}{\\var{f}}=$[[1]]

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$\\displaystyle \\frac{\\var{j}}{\\frac{\\var{h}}{\\var{c}}}=$[[2]]

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Husk at brøkstreken er det samme som et delingstegn.

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Brøken $\\frac{2}{3}$ betyr \"2 delt på 3\". Så brudne brøker er egentlig delingsstykker.   

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Noen eksempler:

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\\[\\frac{7}{\\frac{5}{6}}=7:\\frac{5}{6} =7\\cdot\\frac{6}{5}=\\frac{42}{5}\\]

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\\[\\frac{\\frac{7}{5}}{6}=\\frac{7}{5}: 6=\\frac{7}{5}\\cdot \\frac{1}{6}=\\frac{7}{30}\\]

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\\[\\frac{\\frac{9}{11}}{\\frac{5}{3}}=\\frac{9}{11}:\\frac{5}{3}=\\frac{9}{11}\\cdot \\frac{3}{5}=\\frac{27}{55}\\]

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Vi kan også bruke følgende metode:

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  1. Finn fellesnevner for begge småbrøkene
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  3. Multipliser begge småbrøkene med denne fellesnevneren
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  5. Forkort og regn ut.
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Eksempler på denne måten: $\\require{cancel}$

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\\[\\frac{7}{\\frac{5}{6}}=\\frac{\\:\\frac{7}{1}\\:}{\\:\\frac{5}{6}\\:}=\\frac{\\:\\frac{7}{1}\\cdot 6\\:}{\\:\\frac{5}{\\cancel{6}}\\cdot \\cancel{6}\\:}=\\frac{42}{5}\\]

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\\[\\frac{\\frac{9}{11}}{\\frac{5}{3}}=\\frac{\\frac{9}{\\cancel{11}}\\cdot \\overset{3}{\\cancel{33}}}{\\frac{5}{\\cancel{3}}\\cdot \\overset{11}{\\cancel{33}}}=\\frac{9\\cdot 3}{5\\cdot 11}=\\frac{27}{55}\\]

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$\\simplify{{te[0]} / {ne[0]}}\\cdot\\left(\\simplify[!collectNumbers]{{te[1]} / {ne[1]}+{te[2]}/{ne[2]}}\\right)=$[[0]]

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$\\simplify{{te[3]} / {ne[3]}}\\cdot\\left(\\simplify[!collectNumbers]{{te[4]} / {ne[4]}+{te[5]}/{ne[5]}}\\right)=$ [[1]]

\n

$\\simplify{{te[6]} / {ne[6]}}\\cdot\\left(\\simplify[!collectNumbers]{{te[7]} / {ne[7]}+{te[8]}/{ne[8]}}\\right)=$ [[2]]

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