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Wiskunde

Desimale breuke

Opvoeders afdeling

Memorandum

20.1

a) 260

b) 2 600

c) 26,7

d) 267

e) 2 670

f) 26,79

g) 267,9

h) 2 679

20.2 x10: Elke syfer skuif 1 plek na links / komma skuif 1 plek na regs.

x100: Elke syfer skuif 2 plekke na links / komma skuif 2 plekke na regs.

x1000: Elke syfer skuif 3 plekke na links / komma skuif 3 plekke na regs.

20.4

a) 54,8 548 5480
b) 3,67 36,7 367
c) 8,9 89 890
d) 165,38 1653,8 16 538
e) 282,51 2825,1 28 251

20.5.1

a) 21,522

b) 46,215

c) 1,4

d) 4,64

e) 12 250

f) 2 370,6

  • Antwoord is kleiner.

x met getal<1

20.8

a) 0,4964

b) 1,3737

c) 0,109

d) 5,53724

e) 38,57997

f) 16,78164

23.1 size 12{ div } {} 10: Komma skuif 1 plek na links

Elke syfer skuif een plek na regs

size 12{ div } {} 100: Komma skuif 2 plekke na links

Elke syfer skuif 2 plekke na regs

size 12{ div } {} 1000: Komma skuif 3 plekke na links

Elke syfer skuif 3 plekke na regs

23.3

8,21 0,729 0,6
0,864 0,6254 0,0392 8,791 0,035 0,08
74,68

Leerders afdeling

Inhoud

Aktiwiteit: vermenigvuldiging van desimale breuke [lu 1.3.4, lu 1.7.7, lu 1.9.2, lu 1.10, lu 2.3.3]

20. VERMENIGVULDIGING VAN DESIMALE BREUKE

20.1 Kom ons hersien

Do the following with the help of your calculator:

SOM ANTWOORD
Bv. 2,6 × 10 26
a) 2,6 × 100 .........................
b) 2,6 × 1 000 .........................
c) 2,67 × 10 .........................
d) 2,67 × 100 .........................
e) 2,67 × 1 000 .........................
f) 2,679 × 10 .........................
g) 2,679 × 100 .........................
h) 2,679 × 1 000 .........................

20.2 Werk in groepe van drie. Formuleer gou reëls vir die vermenigvuldiging van desimale breuke met 10, 100 en 1 000.

20.3 Onthou jy nog?

10 x 1 = 10 = 101

10 x 10 = 100 = 102

10 x 10 x 10 = 1 000 = 103

10 x 10 x 10 x 10 = 10 000 = 104

10 x 10 x 10 x 10 x 10 = 100 000 = 105

10 x 10 x 10 x 10 x 10 x 10 = 1 000 000 = 106

20.4 Voltooi die volgende tabel:

× 10 1 10 2 10 3
e.g. 3,2 32 320 3 200
a) 5,48 ..................... ..................... .....................
b) 0,367 ..................... ..................... .....................
c) 0,89 ..................... ..................... .....................
d) 16,538 ..................... ..................... .....................
e) 28,251 ..................... ..................... .....................

20.5 Nog hersiening

20.5.1 Werk saam met ’n maat. Bereken die antwoorde sonder om ’n sakrekenaar te gebruik:

a) s = 3,587 x 6

………………………………………………

………………………………………………

………………………………………………

………………………………………………

b) f = 9,243 x 5

………………………………………………

………………………………………………

………………………………………………

………………………………………………

c) p = 0,02 x 70

………………………………………………

………………………………………………

………………………………………………

………………………………………………

d) r = 0,058 x 80

………………………………………………

………………………………………………

………………………………………………

………………………………………………

e) t = 24,5 x 500

………………………………………………

………………………………………………

………………………………………………

………………………………………………

f) h = 2,634 x 900

………………………………………………

………………………………………………

………………………………………………

………………………………………………

20.5.2 Kontroleer jul antwoorde met ’n sakrekenaar.

20.6 VERMENIGVULDIGING VAN DESIMALE BREUKE MET DESIMALE BREUKE

20.6.1 Lees die volgende probleem en werk dan weer saam met ’n maat deur die verskillende oplossings:

’n Skilpad stap 0,8 km in een uur. Hoe ver sal hy in 0,6 uur stap?

Questions & Answers

what is biology
Hajah Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
what is biology
Victoria Reply
HOW CAN MAN ORGAN FUNCTION
Alfred Reply
the diagram of the digestive system
Assiatu Reply
allimentary cannel
Ogenrwot
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
Hassan Reply
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
Joseph Reply
what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
cell is the building block of life.
Condoleezza Reply
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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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