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Wiskunde

Graad 5

Gewone breuke en desimale breuke

Module 38

Tabelle en kontroles om data te organiseer

Aktiwiteit 1:

Om tabelle en kontroles te gebruik om data te organiseer en aan te teken [lu 5.3]

1. Gebruik nou jou bestaande kennis. Kyk goed na die volgende tabel en voltooi:

T E t h
Bv. 5 9 8 = 5 98 100 size 12{ { { size 8{"98"} } over { size 8{"100"} } } } {} = 5,98
1.1 3 6 = ............ = ............
1.2 1 7 = ............ = ............
1.3 3 6 = ............ = ............
1.4 4 2 8 5 = ............ = ............
1.5 4 7 0 3 = ............ = ............

Kopkrapper!

Hoe lyk die volgende breuke as desimale breuke op die sakrekenaar?

1. 3 100 size 12{ { {3} over {"100"} } } {}

2. 9 100 size 12{ { {9} over {"100"} } } {}

3. 40 100 size 12{ { {"40"} over {"100"} } } {}

4. 80 100 size 12{ { {"80"} over {"100"} } } {}

5. 37 100 size 12{ { {"37"} over {"100"} } } {}

6. 59 100 size 12{ { {"59"} over {"100"} } } {}

Hoe verskil 3 en 4 se antwoorde van die res?

Waarom is dit so?

Het jy geweet?

Ons skryf gewoonlik nie die eind nulle in desimale breuke nie, maar dit is belangrik om hulle wel in die volgende gevalle te skryf:

a) As ons met geld werk: R8,60 (dit wys hoeveel sent daar is)

b) As ons atlete se tyd neem met ’n stophorlosie : 7,30 sekondes. So gee ons uitslae tot ’n honderdste van ’n sekonde

  1. As Ma materiaal gaan koop: 1,70 meter (sodat die verskoopsper­soon presies weet hoeveel cm om af te sny)

Aktiwiteit 2:

Om getalle te herken en voor te stel [lu 1.3]

1. Soms is dit moeilik om te bepaal presies waar ‘n desimale getal in die groot geheel pas. n Getallelyn is ‘n handige hulpmiddel om jou hierin te help, want nou kan jy “sien” hoe die getalle op mekaar volg. Kyk of jy op die getallelyn kan aandui min of meer waar die volgende getalle sal lê:

A : 5,82

B : 5,99

C : 6,09

D : 6,24

Aktiwiteit 3:

Om ‘n reeks tegnieke te gebruik om hoofreken te doen [lu 1.10.2]

1. Kom ons speel ’n speletjie!

Werk saam met ’n maat. Maak beurte. Druk met die agterkant van jou potlood op enige getal terwyl jou oë toe is. Maak dan jou oë oop en sê waaruit dié getal bestaan,

bv. 14,38 = 14 + 3 10 size 12{ { {3} over {"10"} } } {} + 8 100 size 12{ { {8} over {"100"} } } {}

Alles wat jy reg het, moet jy groen inkleur, terwyl jou maat weer alles wat korrek is, blou inkleur. Die een wat iets verkeerd het, mis ’n beurt. Die een wat die meeste blokkies ingekleur het, wen.

Aktiwiteit 4:

Om getalle te herken en te klassifiseer ten einde hulle te vergelyk [lu 1.3.3]

1. Jy weet reeds hoe ons tiendes en honderdstes as desimale breuke skryf. Kyk nou baie goed na die volgende getalle. Vervang die * met<;>of =

Wenk: as jy twyfel oor die korrekte antwoord, breek die getalle eers op soos in die speletjie hierbo.

1.1: 1,7 * 1,07

1.2: 0,6 * 0,06

1.3: 0,58 * 0,9

1.4: 0,34 * 0,4

1.5: 2,05 * 2,5

1.6: 1,8 * 1,80

Kopkrapper!

Hoe lyk een kwart ( 1 4 size 12{ { { size 8{1} } over { size 8{4} } } } {} ) as ’n desimale breuk? .........................

Kan jy die volgende as desimale breuke skryf?

a) 3 4 size 12{ { {3} over {4} } } {} :

b) 1 25 size 12{ { {1} over {"25"} } } {} :

c) 3 20 size 12{ { {3} over {"20"} } } {} :

d) 17 50 size 12{ { {"17"} over {"50"} } } {} :

Aktiwiteit 5:

Om tabelle en kontroles te gebruik om data te organiseer en aan te teken [lu 5.3]

1. Uitdaging!

Neem ’n maatband en meet die lengte van vyf van jou klasmaats (tot twee syfers na die desimale komma). Lys jou resultate in ’n tabel en rangskik jou maats van die kortste tot die langste.

Naam Lengte Genommer :kort na lank
1.1
1.2
1.3
1.4
1.5

Duisendstes

Het jy geweet?

As ek een duisendste 1 1000 size 12{ { {1} over {"1000"} } } {} as ’n desimale breuk moet skryf, sal dit 0,001 wees.

Die nulle is plekhouers vir die ene, tiendes en honderdstes en mag nie weggelaat word nie.

Questions & Answers

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
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
Do you know which machine is used to that process?
s.
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
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 5. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col10993/1.1
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