<< Chapter < Page
  Wiskunde graad 7   Page 1 / 1
Chapter >> Page >

Wiskunde

Desimale breuke

Opvoeders afdeling

Memorandum

23.4.2 a) 0,041

  1. 0,81
  2. 0,0093
  • b en c

23.6 a) 1,234

  1. 0,845
  2. 7,23

25. a) R51

  1. R211,59
  2. 21160c
  3. R2,90
  4. Ja

Koste per oproep: R1,77

  1. 91,5
  2. R102,13
  3. R1,28 x 24 = R30,72
  4. R3,27
  5. Eie antwoord

Leerders afdeling

Inhoud

Aktiwiteit: deling deur veelvoude van 10 [lu 1.5.1, lu 1.7.5]

23.4 DELING DEUR VEELVOUDE VAN 10

23.4.1 Onthou jy nog?

a) As ek 0,8 deur 40 moet deel, doen ek dit so:

0,8 ÷ 40 = (0,8 ÷ 10) ÷ 4

= 0,08 ÷ 4

= 0,02

b) As ek 4,2 deur 600 moet deel, sê ek:

4,2 ÷ 600 = (4,2 ÷ 100) ÷ 6

= 0,042 ÷ 6

= 0,007

23.4.2 Bereken die volgende sonder ’n sakrekenaar:

a) j = 3,28 ÷ 80

…………………………………………………………………………………………..

…………………………………………………………………………………………..

b) d = 567 ÷ 700

…………………………………………………………………………………………..

…………………………………………………………………………………………..

c) g = 18,6 ÷ 2 000

…………………………………………………………………………………………..

…………………………………………………………………………………………..

23.5 DELING DEUR DESIMALE BREUKE

23.5.1 Werk saam met ’n maat deur die volgende voorbeelde:

’n Rol materiaal is 11,25 m lank. Om een rok te maak, word 1,5 m materiaal benodig. Hoeveel rokke kan uit die rol materiaal gesny word?

a) Ek moet 11,25 ÷ 1,5 bereken.Ek verander die desimale getalle eers na breuke :

11 , 25 = 11 25 100 = 11 1 4 size 12{"11","25"="11" { { size 8{"25"} } over { size 8{"100"} } } ="11" { { size 8{1} } over { size 8{4} } } } {} en 1,5 = 1 5 10 = 1 1 2 size 12{1,5=1 { { size 8{5} } over { size 8{"10"} } } =1 { { size 8{1} } over { size 8{2} } } } {}

11 1 4 ÷ 1 1 2 = 45 4 ÷ 3 2 45 4 × 2 3 7 1 2 alignl { stack { size 12{"11" { { size 8{1} } over { size 8{4} } } div 1 { { size 8{1} } over { size 8{2} } } = { { size 8{"45"} } over { size 8{4} } } div { { size 8{3} } over { size 8{2} } } } {} #= { { size 8{"45"} } over { size 8{4} } } times { { size 8{2} } over { size 8{3} } } {} # =7 { { size 8{1} } over { size 8{2} } } {}} } {}

Ek maak gebruik van ekwivalente breuke :

11 , 25 ÷ 1,5 = 11 , 25 1,5 × 10 10 = 112 , 5 15 7,5 7 1 2 alignl { stack { size 12{"11","25" div 1,5= { { size 8{"11","25"} } over { size 8{1,5} } } times { { size 8{"10"} } over { size 8{"10"} } } = { { size 8{"112",5} } over { size 8{"15"} } } } {} #=7,5 {} # =7 { { size 8{1} } over { size 8{2} } } ` {}} } {}

c) Ek moet 11,25 ÷ 1,5 bereken.Ek wil die deler na ’n heelgetal verander sodat ek makliker kan deel.

1,5 × 10 = 15

Nou moet ek net die deeltal ook met 10 vermenigvuldig!

11,25 × 10 = 112,5

Die antwoord is dus 7,5 rokke.

23.5.2 Watter van die bogenoemde metodes is eintlik presies dieselfde?

…………………………………………………………………………………………..

…………………………………………………………………………………………..

23.6 Bereken die volgende deur eers die deler na ’n heelgetal te verander:

a) q = 0,88848 ÷ 0,72

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

b) p = 0,14365 ÷ 0,17

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

c) v = 0,30366 ÷ 0,042

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

…………………………………………………………………………………………..

24. Tyd vir selfassessering

  • Merk die toepaslike blokkie met ’n regmerkie:
JA NEE
Ek kan desimale breuke korrek deur 10 deel
Ek kan desimale breuke korrek deur 100 deel
Ek kan desimale breuke korrek deur 1 000 deel
Ek weet hoe om desimale breuke deur veelvoude van 10 te deel
Ek kan desimale breuke korrek deur desimale breuke deel

25. Kyk na die volgende telefoonrekening en beantwoord dan die vrae. Jy mag jou sakrekenaar gebruik.

a) Rond die koste van die oorsese oproep af tot die naaste rand. ………………..

b) Wat was die totale koste van die oproepe wat gemaak is? ……………………

c) Rond bogenoemde antwoord af tot die naaste sent. …………………………

d) What was the average cost of each cell phone (Vodacom) call? ………………

e) Is MTN goedkoper as Vodacom? ......................... Motiveer.

…………………………………………………………………………………………..

f) Rond die koste van die nasionale oproepe (0 – 50 km) af tot 1 syfer na die desimale teken.

…………………………………………………………………………………………..

g) Wat is die totale koste van die nasionale oproepe? ……………………………

h) As twee “ShareCall” oproepe R1,28 kos, wat sal 48 sulke oproepe kos?

…………………………………………………………………………………………..

i) Die rekening word betaal met ’n R200-noot en ‘n R20-noot. Hoeveel kleingeld moet jy kry?

…………………………………………………………………………………………..

j) Wat is JULLE telefoonrekening gemiddeld per maand oor ‘n tydperk van een jaar?

…………………………………………………………………………………………..

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 1.5: Dit is duidelik wanneer die leerder probleme in konteks oplos, insluitend kontekste wat gebruik kan word om ‘n bewustheid van ander leerareas, asook van menseregte-, sosiale, ekonomiese en omgewingsake, te bevorder, soos:

1.5.1 finansiële kontekste (insluitend wins en verlies, begrotings, rekeninge, lenings, enkelvoudige rente, huurkoop, wisselkoerse);

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:

1.7.5 deling van positiewe desimale getalle van minstens 3 desimale plekke deur heelgetalle.

Questions & Answers

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
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
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
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
how to synthesize TiO2 nanoparticles by chemical methods
Zubear
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Wiskunde graad 7. OpenStax CNX. Oct 21, 2009 Download for free at http://cnx.org/content/col11076/1.2
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Wiskunde graad 7' conversation and receive update notifications?

Ask