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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

what is math number
Tric Reply
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
Sidiki Reply
Need help solving this problem (2/7)^-2
Simone Reply
x+2y-z=7
Sidiki
what is the coefficient of -4×
Mehri Reply
-1
Shedrak
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
An investment account was opened with an initial deposit of $9,600 and earns 7.4% interest, compounded continuously. How much will the account be worth after 15 years?
Kala Reply
lim x to infinity e^1-e^-1/log(1+x)
given eccentricity and a point find the equiation
Moses Reply
12, 17, 22.... 25th term
Alexandra Reply
12, 17, 22.... 25th term
Akash
College algebra is really hard?
Shirleen Reply
Absolutely, for me. My problems with math started in First grade...involving a nun Sister Anastasia, bad vision, talking & getting expelled from Catholic school. When it comes to math I just can't focus and all I can hear is our family silverware banging and clanging on the pink Formica table.
Carole
I'm 13 and I understand it great
AJ
I am 1 year old but I can do it! 1+1=2 proof very hard for me though.
Atone
hi
Adu
Not really they are just easy concepts which can be understood if you have great basics. I am 14 I understood them easily.
Vedant
find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
If f(x) = x-2 then, f(3) when 5f(x+1) 5((3-2)+1) 5(1+1) 5(2) 10
Augustine
how do they get the third part x = (32)5/4
kinnecy Reply
make 5/4 into a mixed number, make that a decimal, and then multiply 32 by the decimal 5/4 turns out to be
AJ
how
Sheref
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
I rally confuse this number And equations too I need exactly help
salma
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
salma
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
hi
salma
hi
Ayuba
Hello
opoku
hi
Ali
greetings from Iran
Ali
salut. from Algeria
Bach
hi
Nharnhar
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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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