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Wiskunde

Desimale breuke

Opvoeders afdeling

Memorandum

MODULE TOETS

1. a) 0,68

  1. 0,875
  2. 0,45 (3)

2. a) 8432,17

8432,168

8432,2 (3)

3.

23,6489
23 648,9
0,236489
236 489

(4)

4. a) 523,017 (2)

  1. 0,987 (3)
  2. 1,34 (2)

5. 180 size 12{ div } {} 2,25

80 keer (4)

6. 88,5 x 28,3

2 504,55 m size 12{ {} rSub {} rSup {} } {} (4)

Leerders afdeling

Inhoud

Aktiwiteit: “noughts and crosses” en module toets

26. Kom ons speel “Noughts and Crosses”!

Jy benodig ’n maat en ’n reghoek met die desimale getalle soos in die voorbeeld.

Jy kan ook jou eie desimale getalle in elke blokkie skryf.

  • Speler 1 kies enige getal op die reghoek en moet dan sê watter getal ÷ 10, 100 of 1 000 of × 10, 100 of 1 000 daardie getal as antwoord sal gee.

Bv. 2,5 : 25 ÷ 10 = 2,5 or

0,025 ´ 100 = 2,5

0,9 2,2 0,45 1,4
2,5 0,08 0,91 0,17
0,007 3,6 0,168 0,024
0,14 0,98 0,016 4,1
  • Speler 2 kontroleer met ’n sakrekenaar.
  • Indien speler 1 korrek is, merk hy/sy sy/haar reghoek met ’n X of 0 .
  • Maak beurte totdat die eerste speler 4 X’e of 0’e in ’n ry kry (horisontaal, vertikaal of diagonaal).

Module toets

1. Skryf as ’n desimale breuk:

a) 17 25 size 12{ { {"17"} over {"25"} } } {} ..................................................

b) 7 8 size 12{ { {7} over {8} } } {} ..................................................

c) 9 20 size 12{ { {9} over {"20"} } } {} .................................................. (3)

2. Rond 8432,1679 af:

a) tot 2 syfers na die desimale teken ..................................................

b) tot die naaste 1 000ste ..................................................

c) tot die naaste tiende .................................................. (3)

3. Voltooi die tabel:

Getal 236,489
÷ 10 .........................
× 100 .........................
÷ 1 000 .........................
× 1 000 .........................

(4)

4. Bereken sonder ’n sakrekenaar:

a) r = 2 000 – 1476,983

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (2)

b) t = R4,70 × 0,21

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (3)

c) u = 26,80 ÷ 20

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (2)

5. Hoeveel keer kan ’n bottel met ’n inhoud van 2,25 liter uit ’n houer wat 180 liter hou, gevul word?

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (4)

6. ’n Ruimteskip beweeg teen 88,5 m per sekonde. Hoe ver sal dit in 28,3 sekondes beweeg?

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (4)

(25)

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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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