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Maak baie seker dat die leerders nie die voorste getal van ‘n aftrekbewerking herbenoem nie. ( Dit is die rede waarom hulle later probleme ondervind as hulle ‘n bewerking waar ‘n groep van 10 ontbind moet word, kry. )

Voorbeeld: 76 - 12 = ______

Probeer dit!

Gooi 76 tellers, wat in tiene en ene gegroepeer is, in ‘n plastieksak.

Laat ‘n leerder nou 2 kom uithaal.

Vra : Hoeveel is in die sak oor? 74

Wat is gedoen? ( 2 ene is uitgehaal) Skryf : 76 - 2 = 74

Laat ‘n ander leerder nou die 10 kom uithaal.

Vra : Wat is nou oor in die sak? 64

Wat is gedoen? ( 1 tien is uitgehaal) Skryf : 74 - 10 = 64

Om te toets, word eers 10 en dan 2 weer terug in die sak gegooi. Nou is daar weer 76 .

Onthou : Alle bewerkings word nog sonder oordrag of ontbinding van ‘n tien gedoen.

Leerders kan horisontaal of vertikaal werk. Dit is hulle keuse.

Help die leerders net om aan die gang te kom met die ontsyfering van die geheime kode. Hulle moet net begryp dat elke teken ‘n letter van die alfabet voorstel. Los hulle dan om self te probeer.

Moedig almal aan om iets met die kode te skryf, al is dit net hul eie naam.

Dit is ook ‘n geleentheid om uit te vind wie reeds die alfabet ken. Dalk kan dit sommer dien as aansporing om dit te leer.

Leerders afdeling

Inhoud

Aktiwiteit: getalle [lu 1.10, lu 1.8, lu 2.2, lu 1.6]

  • Gebruik die getallelyn en vul in: 3 plekke na :
  • Vul in: 2 plekke voor :
LU 1.10
  • Vergelyk die getalle met mekaar:
6 is 2 meer as 4
1 6 is __________________ as 1 4
3 is __________________ as 6
1 3 is __________________ as 1 6
7 is __________________ as 3
1 7 is __________________ as 1 3
27 is __________________ as 23
_____ is 2 meer as 5
_____ is 2 minder as 8
_____ is 1 meer as 9
_____ is 3 minder as 14
LU 1.4
  • Bonnie en Tommie wil graag hulle somme ook op 'n ander manier skryf.
LU 1.8

Voltooi die patrone:

Doen dieselfde met:

4 + 2 = 6 5 + 4 = _____ 3 + 4 = _____
1 4 + 2 = 16 1 5 + 4 = _____ _______________
24 + 2 = _____ 25 + 4 = _____ _______________
34 + 2 = _____ 35 + 4 = _____ _______________
44 + 2 = _____ 45 + 4 = _____ _______________
8 - 3 = 5 5 - 4 = _____ 9 - 2 = _____
1 8 - 3 = 15 1 5 - 4 = _____ _______________
28 - 3 = _____ 25 - 4 = _____ _______________
38 - 3 = _____ 35 - 4 = _____ _______________
48 - 3 = _____ 45 - 4 = _____ _______________
LU 2.2
  • Bonnie sê: Dit is baie makliker om met getalle te werk as jy dit eers uitmekaar haal sodat die tiene en die ene apart is.

Sy herbenoem die getalle. bv. 36 = 30 + 6

  • Tommie sê: Dit is soms nodig om die getalle, nadat jy dit herbenoem het, ook nog anders te groepeer .

Hy hergroepeer dan die getalle. bv. 30 + 6 = 20 + 10 + 6

Herbenoem Hergroepeer

34 = 30 + 4 = 20 + 10 + 4

28 = _____ + _____ = _____ + 10 + 8

46 = _____ + _____ = _____ + 10 + 6

39 = _____ + _____ = _____ + _____ + _____

23 = _____ + _____ = _____ + _____ + _____

55 = _____ + _____ = _____ + _____ + _____

  • Kom ons sit nou weer die getalle aanmekaar:

30 + 10 + 1 = 40 + 1 = 41

20 + 10 + 7 = _____ + _____ = _____

1 0 + 10 + 2 = _____ + _____ = _____

40 + 10 + 9 = _____ + _____ = _____

30 + 10 + 6 = _____ + _____ = _____

20 + 10 = 5 = _____ + _____ = _____

LU 1.10
  • Bonnie en Tommie gaan winkel toe. Bonnie het R5 en Tommie het R6. Op die rak is koekies en sjokolade wat hulle graag wil koop.
  • Hoeveel koekies kan Bonnie vir haar R5 koop?

__________________________ koekies. Teken dit.

  • Hoeveel sjokolades kan Tommie vir sy R6 koop?

__________________________ sjokolades. Teken dit.

LU 1.6

Assessering

Leeruitkomste 1: Die leerder is in staat om getalle en die verwantskappe daarvan te herken, te beskryf en voor te stel, en om tydens probleemoplossing bevoeg en met selfvertroue te tel, te skat, te bereken en te kontroleer.

Assesseringstandaard 1.6: Dit is duidelik wanneer die leerder geldprobleme oplos wat totale en kleingeld in rand en sent behels, insluitend herleiding tussen rand en sent;

Assesseringstandaard 1.8: Dit is duidelik wanneer die leerder die gepaste simbole in berekeninge kan gebruik om probleme wat die volgende behels, op te los;

1.8.1 optelling en aftrekking van heelgetalle met minstens 3 syfers;

1.8.2 vermenigvuldiging van minstens 2-syferheelgetalle met 1-syferheelgetalle;

1.8.3 deling van minstens 2-syferheelgetalle deur 1-syferheelgetalle;

1.8.4 skatting;

Assesseringstandaard 1.10: Dit is duidelik wanneer die leerder die volgende tegnieke gebruik:

1.10.1 opbou en afbreek van getalle;

1.10.2 verdubbeling en halvering;

1.10.3 getallelyne;

1.10.4 afronding in tiene.

Leeruitkomste 2: Die leerder is in staat om patrone en verwantskappe te herken, te beskryf en voor te stel en probleme op te los deur algebraïese taal en vaardighede te gebruik.

Assesseringstandaard 2.2: Dit is duidelik wanneer die leerder eenvoudige getalreekse uit tot minstens 1 000 kopieer en brei.

Questions & Answers

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Source:  OpenStax, Wiskunde graad 3. OpenStax CNX. Oct 14, 2009 Download for free at http://cnx.org/content/col11129/1.1
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