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Pret met die sakrekenaar en negatiewe getalle

Opvoeders afdeling

Memorandum

10. a) 32 x 64 = M+

156 + MR = 2 204

  1. 244 ÷ 61 = M+

236 – MR = 232

11. -8 + (-1) + (9) = 0

-3 + 6 + (8) = -5

(6) + (-1) + -4 = 1

13. a) 27

b) 74

c) 39

d) 15

e) 51

f) 132

g) 9

h) 102

i) 41

j) 51

k) 4

l) 1 000

m) 3 800

n) 100

o) 21

14. a) Getal kleiner as 0

b) Hysbakke; temperature; diepte onder die see

15. a) Leerder se eie antwoord

  1. -1

-3

-5

c) 3; 0; -3; -6; -9; -12; -15; -18; -21; -24

16. a) -6

b) 8

c) 13

d) -14

Leerders afdeling

Inhoud

Aktiwiteit: pret met die sakrekenaar [lo 1.9.2]

10 UITDAGING

Gebruik nou jou sakrekenaar se geheuesleutels om die korrekte antwoorde te bepaal. Skryf neer wat jy sal insleutel:

a) 156 + 32 × 64

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b) 236 – 244 ÷ 61

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11. KOPKRAPPER

Voltooi die volgende. Hou die korrekte volgorde van bewerkings in gedagte.

- 8 + + = 0
+ + +
- 3 + 6 + = - 5
+ + +
+ + - 4 = 1
= - 5 = = - 3

12. SELFASSESSERING

Merk af wat waar is van jou:

Ek kan ONSEKER REDELIK SEKER BAIE SEKER
iets omtrent die geskiedenis van optelmasjiene vertel.
die funksie van elke sleutel op my sakrekenaar verduidelik.
die volgorde van bewerkings korrek toepas.
my sakrekenaar se geheue-sleutels korrek gebruik om probleme op te los.

13. TYD VIR HOOFREKEN

Voltooi die volgende so vinnig en akkuraat moontlik:

a) 13 + 5 + 9 = ___________________

b) 12 + 28 + 34 = ___________________

c) 94 – 19 – 36 = ___________________

d) 78 – 35 – 28 = ___________________

e) 29 + ___________________ = 80

f) ___________________ ÷ 12 = 11

g) 63 ÷ ___________________ = 7

h) een agste van 816 = ___________________

i) (3 × 12) + 5 = ___________________

j) 3 × (12 + 5) = ___________________

k) 18 × ___________________. × 25 = 1 800

l) 56 × 5 × ___________________ = 56 000

m) 25 × 38 × 4 = ___________________

n) 1 400 ÷ ___________________ = 14

o) een kwart van 84 = ___________________

Hierdie keer het ek ___________________________________ reg.

14. KLASBESPREKING: NEGATIEWE GETALLE

Bespreek die volgende en vind antwoorde:

a) Wat is ’n negatiewe getal?

b) Waar gebruik ons negatiewe getalle in vandag se lewe?

c) Teken of plak voorbeelde hiervan uit tydskrifte, koerante, ens. in die onderstaande blok.

+ - 15. ONTHOU!

Om 5 op jou sakrekenaar in te sleutel, druk – 5 OF 5

a) Hoe dui JOU sakrekenaar negatiewe getalle aan? (Wat moet jy insleutel?)

b) Sleutel die getal 7 op jou sakrekenaar in. Trek 2 af. Trek weer 2 af.

Trek weer 2 af. Trek weer 2 af. Wat kry jy? .........................

Trek nog ’n keer 2 af. Skryf neer wat jy op jou vertoonvenster sien. ...............

Trek weer 2 af. Wat sê die sakrekenaar nou? .........................

+ - c) Gebruik jou sakrekenaar se konstante funksie en programmeer hom om vanaf 6 in -3’s te tel. (6 + 3 = = =) Skryf die eerste 10 antwoorde neer.

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16. Doen die volgende met behulp van jou sakrekenaar. Onthou die volgorde van bewerkings! Jy mag ook jou sakrekenaar se geheue gebruik! Skryf alles neer wat jy insleutel om die antwoord te kry.

a) 13 – (11 + 8)

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b) (-3) + 4 + (-2) + 9

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c) -8 + 3 × (-5 + 12)

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d) -2 + 8 – 6 + (-4) – 9 + 12 + (-13)

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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 1.9: Dit is duidelik wanneer die leerder ‘n verskeidenheid tegnieke gebruik om berekeninge te doen, insluitend:

1.9.2: die gebruik van ‘n sakrekenaar.

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Source:  OpenStax, Wiskunde graad 7. OpenStax CNX. Oct 21, 2009 Download for free at http://cnx.org/content/col11076/1.2
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