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Add, subtract, multiply and divide numerical fractions.
", "licence": "Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International"}, "statement": "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.
", "advice": "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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\n$\\displaystyle\\frac{\\var{d}}{\\var{c}}-\\frac{\\var{a}}{\\var{c}}=$[[1]]
", "stepsPenalty": "1", "steps": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "Legg sammen tellerne, la nevneren stå.
\n\nDisse 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.
\nDet 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.
\n\nAnta 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:
\n\\[\\frac{2}{3}+\\frac{5}{3}=\\frac{2+5}{3}=\\frac{7}{3}\\]
\nSamme 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.
\nVi skriver:
\n\\[\\frac{7}{4}-\\frac{3}{4}=\\frac{7-3}{4}=\\frac{4}{4}=1\\]
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\n$\\displaystyle\\simplify{{h}/{f}-{j}/{g}}=$[[1]]
\n$\\displaystyle \\frac{\\var{a}}{\\var{d}}+\\var{f}=$[[2]]
", "stepsPenalty": "2", "steps": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "Finn fellesnevner før du adderer eller subtraherer.
\n\nEksempel: 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.
\nVi skriver slik:
\n\\[\\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}\\]
\n\n\nOfte 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:
\n\\[\\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}\\]
\n\n\nHusk 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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\n$\\displaystyle -\\frac{\\var{f}}{\\var{j}}\\cdot \\var{d}=$[[1]]
\n\n\n", "stepsPenalty": "1", "steps": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "Multipliser teller med teller og nevner med nevner.
\n\nEksempel:
\n\\[\\frac{4}{5}\\cdot \\frac{2}{3}=\\frac{4\\cdot 2}{5 \\cdot 3}=\\frac{8}{15}\\]
\n\n\nHusk 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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\n$\\displaystyle \\frac{\\var{b}}{\\var{c}}: \\var{d}=$[[1]]
\n$\\displaystyle \\var{j}: \\left(\\frac{\\var{-d}}{\\var{f}}\\right)=$[[2]]
\n", "stepsPenalty": "2", "steps": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "Når vi dividerer to brøker, kan vi regne ut ved å i stedet multiplisere med den omvendte brøken.
\n\nNår 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 $\\frac{1}{6}$
\nHvordan finner man f.eks halvparten av en brøk? Man kan \"dele på to\", eller man kan multiplisere med det omvendte tallet, nemlig $\\frac{1}{2}$.
\n\nAnta 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 $\\frac{4}{5}$.
\nVi kan skrive slik:
\n\\[\\frac{3}{7}:\\frac{5}{4}=\\frac{3}{7}\\cdot\\frac{4}{5}=\\frac{3\\cdot 4}{7\\cdot 5}=\\frac{12}{35}\\]
\n"}], "gaps": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "(f*j)/(h*g)", "maxValue": "(f*j)/(h*g)", "correctAnswerFraction": true, "allowFractions": true, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "b/(c*d)", "maxValue": "b/(c*d)", "correctAnswerFraction": true, "allowFractions": true, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "j*f/(-d)", "maxValue": "j*f/(-d)", "correctAnswerFraction": true, "allowFractions": true, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "
$\\displaystyle \\frac{\\frac{\\var{b}}{\\var{c}}}{ \\frac{\\var{a}}{\\var{d}}}=$[[0]]
\n\n$\\displaystyle \\frac{\\frac{\\var{d}}{\\var{g}}}{\\var{f}}=$[[1]]
\n\n$\\displaystyle \\frac{\\var{j}}{\\frac{\\var{h}}{\\var{c}}}=$[[2]]
\n", "stepsPenalty": "2", "steps": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "Husk at brøkstreken er det samme som et delingstegn.
\n\nBrøken $\\frac{2}{3}$ betyr \"2 delt på 3\". Så brudne brøker er egentlig delingsstykker.
\n\nNoen eksempler:
\n\\[\\frac{7}{\\frac{5}{6}}=7:\\frac{5}{6} =7\\cdot\\frac{6}{5}=\\frac{42}{5}\\]
\n\\[\\frac{\\frac{7}{5}}{6}=\\frac{7}{5}: 6=\\frac{7}{5}\\cdot \\frac{1}{6}=\\frac{7}{30}\\]
\n\\[\\frac{\\frac{9}{11}}{\\frac{5}{3}}=\\frac{9}{11}:\\frac{5}{3}=\\frac{9}{11}\\cdot \\frac{3}{5}=\\frac{27}{55}\\]
\nVi kan også bruke følgende metode:
\nEksempler på denne måten: $\\require{cancel}$
\n\\[\\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}\\]
\n\\[\\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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\n$\\simplify{{te[3]} / {ne[3]}}\\cdot\\left(\\simplify[!collectNumbers]{{te[4]} / {ne[4]}+{te[5]}/{ne[5]}}\\right)=$ [[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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