# 2.14 To use divisibility rules

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2.3 1.1 12

1.2 6

1.3 9

1.4 8

1.5 5

1.6 12

1.7 45

1.8 50

1.9 900

1.10 500

1.11 580

1.12 100

1.13 2

1.14 12,5 / 12½

1.15 6

## Activity: to use divisibility rules [lo 1.12.1]

Now you can test your skill in division and use the new knowledge that you have gained effectively. Let us see how you cope with the following mental calculation test. Write down answers only, as quickly as you can.

1.1 72 ÷ 6 = ___________________

1.2 54 ÷ 9 = ___________________

1.3 63 ÷ 7 = ___________________

1.4 48 ÷ ___________________ = 6

1.5 35 ÷ ___________________ = 7

1.6 108 ÷ ___________________ = 9

1.7 ___________________ ÷ 5 = 9

1.8 4 500 ÷ ___________________ = 90

1.9 45 000 ÷ 50 = ___________________

1.10 45 000 ÷ ___________________ = 90

1.11 5 800 ÷ 10 = ___________________

1.12 8 900 ÷ ___________________ = 89

1.13 2 420 ÷ 20 = (2 420 ÷ 10) ÷ ___________________

1.14 A half ´ 25 = ___________________

1.15 (30 ÷ 5) = (36 ÷ ___________________)

15

Fill in: I got ___________________ correct!

TIME FOR SELF-ASSESSMENT!

How well do you know the work we have done up to now? Indicate this by marking the appropriate block:

 Tick the applicable block Not at all Very uncertain Somewhat uncertain Very well I know my ÷ tables. (LO 1.9) ____ ____ ____ ____ I knew most of the revision questions. (LO 1.12) ____ ____ ____ ____ I can formulate rules for division by powers of 10 (10 ; 100 ; 1 000 ; 10 000) (LO 1.12) ____ ____ ____ ____ I can divide correctly by 1 000 (LO 1.12) ____ ____ ____ ____ I can divide correctly by 10 000 (LO 1.12) ____ ____ ____ ____ It is easy for me to divide by 10 and 100 (LO 1.12) ____ ____ ____ ____

BRAIN-TEASER!

Francois has a bag of marbles. If he divides them into groups of 4, 2are left over. If he divides them into groups of 5, 1 is left over. How many marbles can there be in his bag? Could you write down 5 possible answers in the bag?

## Assessment

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 1.12: We know this when the learner recognises, describes and uses:

1.12.1: divisibility rules for 2, 5, 10, 100 and 1 000.

can someone help me with some logarithmic and exponential equations.
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
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
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
a perfect square v²+2v+_
kkk nice
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
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Kristine 2*2*2=8
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is it 3×y ?
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im not good at math so would this help me
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
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what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
what is nano technology
what is system testing?
preparation of nanomaterial
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
what is system testing
what is the application of nanotechnology?
Stotaw
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
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
how did you get the value of 2000N.What calculations are needed to arrive at it
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