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a)

Ek herlei eers die desimale breuke na gewone breuke:

0,8 × 0,6 = 8 10 × 6 10 48 100 alignl { stack { size 12{0,8 times 0,6= { { size 8{8} } over { size 8{"10"} } } times { { size 8{6} } over { size 8{"10"} } } } {} #= { { size 8{"48"} } over { size 8{"100"} } } {} } } {}

Hy stap dus 0,48 km.

b) Ek werk eers 8 × 6 uit. Die antwoord is 48. Nou tel ek die aantal plekke na elke desimale komma. Daar is 2. My antwoord moet dus 2 (twee) syfers na die desimale komma hê.

Die antwoord is dus 0,48.

20.6.2 Wat merk julle op as julle die antwoord (produk) met die vermenigvuldigtal vergelyk?

…………………………………………………………………………………………..

…………………………………………………………………………………………..

Kan julle dit verklaar?

…………………………………………………………………………………………..

…………………………………………………………………………………………..

20.7 ONTHOU!

20.8 Bereken die volgende op jou eie sonder ’n sakrekenaar:

a) j = 0,146 x 3,4

b) v = 2,41 x 0,57

c) u = 0,025 x 4,36

d) g = 8,143 x 0,68

e) d = 7,293 x 5,29

f) o = 3,849 x 4,36

21. Tyd vir selfassessering

  • Merk die toepaslike blokkie met ’n :
ONSEKER SEKER
Ek kan desimale breuke korrek optel
Ek kan desimale breuke korrek van mekaar aftrek
Ek kan desimale breuke korrek met 10 vermenigvuldig
Ek weet hoe om desimale breuke met 100 te vermenigvuldig
Ek kan die produk van desimale breuke en 1 000 korrek bereken
Ek kan desimale breuke met heelgetalle vermenigvuldig
Ek kan desimale breuke met desimale breuke vermenigvuldig

22. Kom ons speel ’n speletjie

Jy het ’n maat en ’n sakrekenaar vir hierdie speletjie nodig. Sleutel enige desimale getal op jou sakrekenaar in. Deel dit dan deur 10, 100 of 1 000. Gee dan die sakrekenaar vir jou maat. Hy / sy moet weer die oorspronklike getal kry.

Bv. Speler 1 sleutel in: 43,674Speler 1 deel 43,674 deur 1 000 en kry 0,043674.Speler 2 moet nou weer 43,674 op die skerm kry.Speler 2 moet dus × met 1 000!

23. DELING DEUR DESIMALE BREUKE

Kom ons hersien eers

23.1 Deel in groepe van drie. Kan julle aan mekaar verduidelik wat gebeur wanneer ons natuurlike en desimale getalle deur 10, 100 of 1 000 deel?

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

23.2 Maak nou beurte om vir mekaar die volgende antwoorde hardop te sê. Die derde persoon kan die antwoorde met ’n sakrekenaar kontroleer.

a) 6 ÷ 10

b) 0,3 ÷ 10

c) 0,06 ÷ 100

d) 2,9 ÷ 100

e) 4 ÷ 100

f) 15,8 ÷ 100

g) 8 ÷ 1 000

h) 39,2 ÷ 100

i) 34,67 ÷ 1 000

j) 27,458 ÷ 10

23.3 Kleur die korrekte antwoorde in en vind so die “pad” na die huis.

a) 82,1 ÷ 10

b) 86,4 ÷ 100

c) 746,8 ÷ 10

d) 625,4 ÷ 1 000

e) 39,2 ÷ 1 000

f) 72,9 ÷ 100

g) 879,1 ÷ 100

h) 6 ÷ 10

i) 35 ÷ 1 000

j) 8 ÷ 100

BEGIN
8,21 0,821 6,254 39,2 0,729 879,1 0,6 35 0,8
0,864 7,468 0,6254 0,0392 7,29 8,791 6 0,035 0,08
8,64 74,68 62,54 3,92 729 87,9 60 3,5 80

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 1.3: Dit is duidelik wanneer die leerder die volgende getalle herken, klassifiseer en voorstel sodat dit beskryf en vergelyk kan word:

1.3.4 getalle in eksponensiële vorm, insluitend kwadrate van natuurlike getalle tot minstens 12 2 , natuurlike getalle tot die derde mag tot minstens 5 3 , asook die vierkants- en derdemagswortels van hierdie getalle;

Assesseringstandaard 1.7: Dit is duidelik wanneer die leerder skat en bereken deur geskikte bewerkings vir probleme wat die volgende behels, te kies en te gebruik:

1.7.7 eksponente;

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;

Assesseringstandaard 1.10: Dit is duidelik wanneer die leerder ‘n verskeidenheid strategieë gebruik om oplossings te kontroleer en die redelikheid daarvan te beoordeel.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder voorstellings maak van en verwantskappe tussen veranderlikes gebruik sodat inset- en/of uitsetwaardes op ‘n verskeidenheid maniere bepaal kan word deur die gebruik van:

2.3.3 tabelle.

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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