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Number concept

Educator section


1. Look at the tenth didgit. If 5 or more, add one to hundreth number. If 4 or less the hundreth number stays the same. Replace tenth and one-numbers with nought.

2. hundreds

thousands add one

hundreds, tens and ones

3.1 8 000 8 000

3.2 47 200 47 000

3.3 150 500 151 000

3.4 3 409 200 3 409 000

3.5 5 631 000 5 631 000

Brain teaser

i) R90 000

ii) R14 000

Leaner section


Activity: to calculate by selecting appropriate operations for solving problems[lo 1.8.1]

1. In Grade 5 we saw repeatedly how important it was to round off correctly. Amongst other things, it can help us to estimate an answer quickly, without using pencil and paper.

Rounding off

  • Let's revise
  • Explain to your friend how we round off to the nearest 100.

2. Try to complete the following on your own:

If you are unable to do it on your own, ask a friend to help you!

3. Complete the following table:

number rounded off to the nearest 100 rounded off to the nearest 1 000
3.1 7 995
3.2 47 216
3.3 150 505
3.4 3 409 235
3.5 5 630 981


  • Can you round off the following to the nearest 10 000?

i) __________________________________________________________________

Price R89 895

ii) __________________________________________________________________

Price R13 995


How well do you understand the preceding work? Assess yourself on a scale of 1 to 4. Circle the appropriate code:

1 = needs attention

2 = fairly good

3 = very good

4 = excellent

Criteria: Code
I can read 7-digit numbers correctly. (LO 1.3) 1 2 3 4
I can write 7-digit numbers correctly in words. (LO 1.3) 1 2 3 4
I am able to determine the value of digits in a number correctly. (LO 1.4) 1 2 3 4
I understand the powers of 10 and can use them correctly. (LO 1.10) 1 2 3 4
I can round off correctly to the nearest 100. (LO 1.8) 1 2 3 4
I can round off correctly to the nearest 1 000. (LO 1.8) 1 2 3 4
I can round off correctly to the nearest 10 000. (LO 1.8) 1 2 3 4


Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems.

Assessment Standard 1.8: We know this when the learner estimates and calculates by selecting and using operations appropriate to solving problems that involve:

1.8.1: rounding off to the nearest 5, 10, 100 or 1 000.

Questions & Answers

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
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
characteristics of micro business
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 ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Mathematics grade 6. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11030/1.1
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