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antwoorden oefentoets januari 2004
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antwoorden oefentoets basale gecijferdheid jan 2004
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By: suussoons • 6 year ago
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esmeehoffmann
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Opgave 1 Hoofdrekenen en handig rekenenLos elk van de volgende opgaven op met behulp van handig rekenen. Je mag
dus niet cijferen of gebruik maken van rekentrucjes zonder inzicht
Licht bij alle onderdelen je antwoord duidelijk toe!
a. 35,36 + 27,81 + 14,64 + 32,19 =
Ik zet ze in een andere volgorde: 35,36 + 14,64 = 50 en 27,81 + 32,19 = 60
50 + 60 = 110
b. 670,11 – 15,98 =
Ik maak er even geld van:
€ 670,11 - € 16,- = € 654, 11
€ 654, 11 + € 0,02 = € 654,13
Ik kan beide getallen ook met 0,02 ophogen, dan wordt de opgave: 670,13 – 16 = 654,13
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c. (2,83 x1,5) + (8 x 2,83) =
2
Ik maak er weer geld van. Hier staat eigenlijk 1,5 x € 2,83 erbij 8,5 x € 2,83.
(Verhaaltje bij de som: ik koop 1,5 kg. bananen à € 2,83 per kilo en daarna nog 8,5 kilogram
voor dezelfde prijs. Hoeveel moet ik betalen?)
10 x € 2,83 = € 28,30
d. 3913,39 : 13 =
Kommagetal, dus ik maak er weer even geld van.
€ 3900 : 13 = € 300,-
€ 13 : 13 = € 1,-
€ 0,39 : 13 = € 0,03
Bij elkaar: € 3913,39 : 13 = € 301,03
1
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