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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 is variations in raman spectra for nanomaterials
Jyoti Reply
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
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
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 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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