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Wiskunde

Graad 4

Heelgetalle en hul verwantskappe

Module 2

Plekwaardes van syfers in heelgetalle

Aktiwiteit 1:

  • Om plekwaardes van syfers in heelgetalle te herken [LU 1.4]
  • Om heelgetalle te herken en voor te stel deur hulle beskryf en te vergelyk [LU 1.3.1]

DIE MODERNE GETALLESTELSEL: DIE DESIMALE STELSEL

  • Noudat ons mondelinge tel-oefeninge en hoofrekene gedoen het, gaan ons kyk na die betekenis van ons getallestelsel.
  • Kom ons kyk wat Jannie oor Susie vertel. Dit klink vreemd, nie waar nie?
  • 1+1 is nie elf nie! Maar miskien moet ons na Romeinse syfers kyk: I +I = II. Dan sal dit reg wees. II is hoe die Romeine 2 geskryf het. In AKTIWITEIT 5 sal ons meer oor Romeinse syfers leer.

1. Laat ons na ‘n groter getal kyk. Wat presies beteken die getal 1 111, en hoekom? Probeer om die betekenis neer te skryf:

Dalk kan ons sê dat dit die volgende beteken:

2. Watter getal dink jy word in hierdie diagram voorgestel? Skryf jou antwoord neer in die blokkie onder die diagram.

  • Ons desimale stelsel maak gebruik van groepe van los ene (eenhede), tiene, honderde, duisende en tienduisende. Ons kan tot nege aparte blokke hê. Sodra ons nog 'n blok bykry, sê ons dat ons tien blokke / 10 het, d.w.s. een groep van tien en niks wat los oorbly nie. In die leë blok sit ons ‘n “0” om te sê daar is niks wat oorbly nie. Met blokke lyk dit dan so:
  • Omdat ons nie altyd blokke kan teken nie, gebruik ons die POSISIE van die syfers om te sê hoeveel in daardie groep is. Daarom praat ons van plekwaardes:
DUISENDE HONDERDE TIENE ENE
1 000 100 10 1
10 x 10 x 10 10 x 10 10 1

Hersiening: ons desimale stelsel

In ons getallestelsel maak ons gebruik van nege simbole en “0”. Ons gebruik die simbole, 1; 2; 3; 4; 5; 6; 7; 8; 9 en 0 om enige en al die getalle wat ons nodig het te skryf. Ons maak gebruik van die posisie van die syfer soos dit in die getal is om sy waarde aan te dui. In die getal 2 768 beteken die 7 eintlik 700 as gevolg van waar dit in die getal staan .

Indien daar geen duisende is nie (of syfers in die ander kolomme nie) gebruik ons die 0 om die plek te hou.

Let wel: Ons kan nie die 0 weglaat nie . As ons die 0 weglaat, sal die waarde van die hele getal verander (bv.: 10 291 sal 1 291 word). Die 0 is dus besonder belangrik.

  1. Skryf elkeen van die getalle hieronder in UITGEBREIDE NOTASIE. Die een bo-aan die lys lyk so: 2 768 = 2 000 + 700 + 60 + 8

Voltooi nou die volgende:

2 768 = 2 000 + 700 + 60 + 8
7 834 =...............................................................................................................................
2 056 =
8 503 =
1 940 =
16 473 =
25 809 =

Let wel:

Wanneer ons ‘n groot getal skryf , laat ons ‘n spasie tussen die duisende en die honderde. Dit maak die lees van die getal makliker. Sleutel 10 403 op jou sakrekenaar in. Die sakrekenaar los nie hierdie spasie nie. Jy sal agterkom dat dit nie so maklik is om die getal te lees wanneer die spasie tussen die duisende en die honderde nie daar is nie. Wanneer jy self groot getalle neerskryf, moet jy seker maak dat jy die spasie in die korrekte plek laat.

DIE MAAK VAN GETALLE EN OM HULLE IN DIE KORREKTE ORDE TE RANGSKIK

Questions & Answers

how can chip be made from sand
Eke Reply
is this allso about nanoscale material
Almas
are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where is the latest information on a no technology how can I find it
William
currently
William
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
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Source:  OpenStax, Wiskunde graad 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11100/1.1
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