# 3.5 Scale drawings  (Page 2/2)

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It might help them to draw the diagrams.

The decision to make use of carried numbers is left to the educator.

First supply paper shapes for dividing into tens, so that the learners may discover for themselves that tenths , like thirds and fifths, have to be calculated and measured. It is not simply a matter of folding and folding again as in the case of a ½ and a ¼ .

Guide them to discover that they, by first obtaining fifths , can divide each fifth down the middle to obtain tenths .

Discuss symmetrical shapes with the learners. Let them identify symmetrical objects in the classroom. They should complete the drawing after this exercise.

## Activity: scale drawings [l0 1.8, l0 4.5, l0 5.5 ]

Bonny and Tommy enjoyed watching the elephants most of all. There were large ones and small ones.

• Which trunk is the longest? ________________________________________
• Which trunk is the shortest? ________________________________________
• What can you deduce from this? ____________________________________

Each of the spaces between * and * on the number line represents 20 cm. Use any method to calculate the length of each trunk:

Some animals eat meat . They are carnivores .

Others eat plants and they are herbivores .

The carnivores together eat 100 kg of meat every day.

• Complete:
 Days: 1 2 3 4 Kg: 100
• Their meat is packed in 50 kg packets. How many packets of meat could the keeper make from 400 kg of meat?

He could _____________________________________________________________

This is enough meat for _____________________________________________ days.

• There are 4 cages with birds. They eat 1 kg of seed every day.

How many 250g containers will this make? (Draw the 250g containers.)

• The people at the zoo bought 5 packets of seed weighing 20 kg each. This is enough seed for _________________ days.
• Draw all the 20 kg packets of seed that are needed for 1 year.
• This is how much drinking water is placed in the monkeys’ cages every day:
• Draw the 1ℓ containers that can be filled from this.
• Draw the 500 mℓ containers that can be filled from this.
• Use your own method to do the calculations.

The small antelope drinks 125 mℓ of milk at a time. He gets milk 4 times per day. How much milk does he drink altogether?

It drinks _____________________________________________________________

• There are 69ℓ of water that have to be taken to 3 lion cages. How many litres of water can be taken to each cage?

Each cage ____________________________________________________________

• One of the monkeys is ill and the vet has said that it must be given 20 mℓ of medicine in the morning and in the evening. How many teaspoonfuls will it drink in a day? Remember: 1 t = 5 mℓ

It will drink ___________________________________________________________

## 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 1.8: We know this when the learner can perform calculations, using appropriate symbols, to solve problems;

Learning Outcome 4: The learner will be able to use appropriate measuring units, instruments and formulae in a variety of contexts.

Assessment Standard 4.5: We know this when the learner estimates, measures, compares and orders three-dimensional objects using non-standard and standard measures;

Learning Outcome 5: The learner will be able to collect, summarise, display and critically analyse data in order to draw conclusions and make predictions, and to interpret and determine chance variation.

Assessment Standard 5.5: We know this when the learner reads and interprets data presented in simple tables and lists.

What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
what does nano mean?
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
While the American heart association suggests that meditation might be used in conjunction with more traditional treatments as a way to manage hypertension
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