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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

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
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?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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
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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