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Wiskunde

Getalbegrip, optelling en aftrekking

Aftrekking

Opvoeders afdeling

Memorandum

1.1 378 767

1.2 366 269

1.3 613 751

Leerders afdeling

Inhoud

Aktiwiteit: om die gelykwaardigheid en geldigheid van verskillende voorstellings te bepaal [lu 2.6.3]

Om strategieë te gebruik om oplossings te kontroleer [lu 1.11]

1. In die vorige aktiwiteit het julle sekerlik ‘n verskeidenheid van metodes gesien. Kom ons kyk na nog metodes om die verskil te bereken. Verdeel in groepe van drie. Lees die volgende probleem goed deur. Jou opvoeder sal julle groep nommer en sê na watter oplossing julle groep moet kyk. Bespreek dit en verduidelik dan vir die res van die klas hoe die antwoord bereken is:

As die aftrektal 631 524 is en die verskil 254 637, wat is die aftrekker?

1.1 Ek trek af deur terug te tel.

631 524 – 254 637

631 524 – 200 000

  • 431 524 – 50 000
  • 381 524 – 4 000
  • 77 524 – 600
  • 376 924 – 30
  • 376 894 - 7

= 376 887

Die aftrekker is 376 887.

1.2 Ek gebruik die kompensasiewet vir aftrekking.

631 524 – 254 637

+ 363 + 363

  • 631 887 – 255 000

+ 5 000 + 5 000

  • 636 887 – 260 000

376 887

  • Ek werk met negatiewe getalle en skryf dit so:

631 524
254 637
-3 (4 – 7)
-10 (20 – 30)
-100 (500 – 600)
-3 000 (1 000 – 4 000)
-20 000 (30 000 – 50 000)
400 000 (600 000 – 200 000)
376 887 (400 000 – 20 000 – 3 000 – 100 – 10 – 3)

1.4 ’n Baie kort manier om die aftrekker te bereken, is:

5 12 10 14 11 14

6 3 1 5 2 4

- 2 5 4 6 3 7

3 7 6 8 8 7

1.5. Kan julle groep aan ’n ander metode dink om die antwoord te bereken?

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2. Watter een van die bogenoemde metodes verkies JY?

_____________________________________________________________________

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Hoekom?

_____________________________________________________________________

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Assessering

Leeruitkomste 1: Die leerder is in staat om getalle en hul verwantskappe te herken, te beskryf en voor te stel. Hulle kan ook met bekwaamheid en vertroue tel, skat, bereken en kontroleer tydens die oplos van probleme.

Assesseringstandaard 1.11: Dit is duidelik wanneer die leerder ‘n verskeidenheid strategieë gebruik om oplossings te kontroleer en die redelikheid van oplossings te beoordeel.

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 2.6: Dit is duidelik wanneer die leerder deur bespreking en vergelyking, die ekwivalensie van verskillende beskrywings van dieselfde verwantskap of reël wat soos volg voorgestel word, bepaal:

2.6.3: met getalsinne.

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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Nel Reply
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Nel Reply

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Source:  OpenStax, Wiskunde graad 6. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11072/1.1
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