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Wiskunde

Pret met die sakrekenaar en negatiewe getalle

Opvoeders afdeling

Memorandum

5. a) 108

b) 9

c) 13

d) 68

e) 14

f) 4

g) 48

h 72

i) 200

j) 18 000

k) 20

l) 9

m) R238

n) R6 080

o) 54

Leerders afdeling

Inhoud

Aktiwiteit: pret met die sakrekenaar [lu 1.9.2]

Pret met die sakrekenaar

1. Het jy geweet dat sakrekenaars ook kan “praat”? Sleutel die volgende op jou sakrekenaar in: 0,65 + 0,1234 =

Draai nou jou sakrekenaar onderstebo. Wat lees jy?

___________________________________________________________

In hierdie module gaan ons leer hoe om die sakrekenaar effektief te gebruik om berekeninge maklik te doen.

2. HET JY GEWEET?

5 000 jaar gelede het die Babiloniërs ’n optelmasjien ontwerp wat hulle ’n abakus genoem het. Die Chinese gebruik vandag steeds ’n variasie hiervan. Hulle abakus bestaan uit krale wat jy op ’n telraam op en af moet skuif.

In 1642 het Blaise Pascal van Frankryk ’n optelmasjien ontwerp wat met draaiknoppe gewerk het. Dit was egter te duur om te bou.

’n Britse wiskundige, Charles Babbage, het in 1830 begin werk aan ’n analitiese enjin wat deur stoom aangedryf is. Hy het vir 37 jaar probeer om hierdie enjin , wat verskillende berekeninge kon doen, te bou, maar is oorlede voordat hy dit kon voltooi.

3. KOM ONS HERSIEN

Werk saam met ’n maat en soek die volgende sleutels op jou sakrekenaar:

AC = wis alles, insluitende die geheue, uit
C = maak die vertoonvenster skoon
CE / CM = maak die geheue skoon
Min / M / M+ ____________________________________
STO = bêre in die geheue / tel op
M- = trek van die geheue af
RCL / x M ____________________________________
MR / RM = roep die geheue op
O m / O m = jy het nie die geheue skoongemaak nie

Het jou sakrekenaar ’n ander sleutel wat jy moet druk om bogenoemde te doen? Skryf dit hieronder neer:

______________________________________________________________

______________________________________________________________

______________________________________________________________

______________________________________________________________

4. ONTHOU JY NOG?

Ons kry ’n gewone sakrekenaar en ’n wetenskaplike sakrekenaar. Laasgenoemde kan meer ingewikkelde berekeninge doen. Vergelyk jou sakrekenaar met dié van jou klasmaats en kyk hoe hul ooreenstem / verskil.

5. Voordat ons verder met die sakrekenaar gaan werk, moet jy eers jou eie breinkrag inspan. Voltooi die volgende hoofrekentoets so vinnig en akkuraat moontlik.

a) 12 × 9 = __________

b) __________ × 7 = 63

c) 48 + __________ = 61

d) __________ - 18 = 50

e) 63 - __________ = 49

f) (12 × 8) + __________ = 100

g) 8 × 3 × 3 = __________

h) __________ ÷ 8 = 9

i) 80 × 40 = __________

j) 300 × 60 __________

k) 500 ÷ 25 = __________

l) one third of 27 = __________

m) R2,38 × 100 = __________

n) R6,08 × 1 000 = __________

o) __________ ÷ 6 = 9

15

Voltooi deur die toepaslike blokkie in te kleur:

Ek het GOED GEMIDDELD SWAK Gevaar.

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 1.9: Dit is duidelik wanneer die leerder ‘n verskeidenheid tegnieke gebruik om berekeninge te doen, insluitend:

1.9.2: die gebruik van ‘n sakrekenaar.

Questions & Answers

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
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
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
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
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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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