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Wiskunde

Graad 5

Meting en tyd

Module 40

Lengte

In hierdie leereenheid gaan ons kyk na verskillende eenhede om lengte mee te meet, asook na die belangrikheid daarvan om akkuraat te meet.

Aktiwiteit 1:

Om te meet en op te teken [lu 4.5.3]

Om met toepaslike meetinstrumente presies te meet [lu 4.7.3]

1. Kom ons spring sommer dadelik weg! Hoe goed ken jy jouself? Meet die volgende so akkuraat moontlik – ‘n maat mag jou help:

1.1 die lengte van jou duimnael

1.2 die lengte van jou pinkie

1.3 die lengte van jou regtervoet

1.4 die lengte van jou linkerarm van jou skouer tot by die punt van jou middelvinger

1.5 Hoe lank is jy?

1.6 Hoe hoog kan jy bykom as jy spring van die grond af?

1.7 Hoeveel hoër is dit as jyself?

2. Wat het jy gebruik om bogenoemde te meet?

3. Watter ander meetinstrumente kan ons nog gebruik om lengtes mee te meet?

Onthou jy nog?

1 cm = 10 mm

1 m = 100 cm

1 m = 1 000 mm

1 km = 1 000 m

Het jy geweet?

  • 1 meter is omtrent die afstand van ’n grootmens se neus tot by die punt van sy uitgestrekte hand se middelvinger.
  • 1 cm is ongeveer die lengte van ’n vingernael.
  • 10 cm is ongeveer die lengte van ’n hand.
  • 1 mm is min of meer die breedte van die spasie onder jou vingernael.
  • 10 mm is ongeveer die breedte van ’n pinkie.

4. Werk saam met ’n maat en voltooi die volgende tabel.

Meet Skatting Ware afmeting Verskil
a) die lengte van jou opvoeder
b) die breedte van jul klaskamer
c) die hoogte van jou bank / tafel
d) die totale lengte van die skryfbord in die klas

Aktiwiteit 2:

Om probleme op te los wat die kies van berekening met en herlei van standaard- eenhede insluit [lu 4.6]

1. Dit is belangrik dat ons sal weet watter meeteenhede vir spesifieke lengtes gebruik word. Om dit korrek te kan doen, is dit noodsaaklik dat ons sal weet presies hoe lank die verskillende meeteenhede is. Kom ons kyk hoe vaar jy! Kies ‘n geskikte eenheid om die volgende te meet:

1.1 Die borsmaat van Pa se pak klere is 102 ....................

1.2 Die hoogte van my kamermuur is 4 ....................

1.3 Die breedte van die stoep van die plaashuis is 2,5 ....................

1.4 Die dikte van my woordeboek is 40 ....................

1.5 Die afstand tussen Johannesburg en Kaapstad is meer as 1 000 ....................

1.6 Die diepte van die water in ons swembad is 1,500 ....................

2. Omkring die afmeting wat die naaste aan die werklikheid is:

2.1 Die deur van ons klas is ongeveer . . . . . . . . hoog.

(a) 20 m (b) 200 mm (c) 2 km (d) 2 m

2.2 My voet is omtrent . . . . . . . . lank.

(a) 26 cm (b) 26 mm (c) 26 km (d) 26 m

2.3 Die afstand van Durban na Oos-Londen is . . . . . . . . . . .

(a) 674 mm (b) 674 km (c) 674 m (d) 674 cm

3. Kom ons kyk na die desimale skryfwyse van lengte:

Ons weet reeds 10 mm = 1 cm

Dus: 25 mm = 10 + 10 + 5 mm

= 1cm + 1 cm + 5 mm

= 2 cm + 5 mm

= 2,5 cm of 2 1 2 size 12{ { { size 8{1} } over { size 8{2} } } } {} cm

Voltooi die tabel:

Aantal mm 10 85 ............ 245 ............ 1 026 ............
Aantal cm 1 ............ 4,2 ............ 17,9 ............ 146,3

4. Ons weet daar is 1 000 mm in 1 m

Dus: 2 347 mm = 2 m 347 mm

= 2,347 m

Voltooi die tabel:

mm m
4 328 4,328
..................... 3
367 .....................
..................... 4,7
28 .....................
..................... 0,067
6 .....................

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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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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