1.6 Counting in tens

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Memorandum

Count in tens regularly, forwards and backwards, from any number.

E.g. 4 14 24 34 44 54 64 74 84 94

97 87 77 67 57 47 37 27 17 7

The learners should be aware of how important the number 10 is in our number system (decimal system).

They should know the combinations of 10 very well and must be tested regularly. Much practice is required.

Activity: counting in tens [lo 1.3, lo 1.11, lo 1.8, lo 2.2, lo 1.7]

• Write down the number and number name for each letter:

A: ______________________________ ______________________________

B: ______________________________ ______________________________

C: ______________________________ ______________________________

D: ______________________________ ______________________________

E: ______________________________

______________________________

F: ______________________________

______________________________

G: ______________________________

______________________________

H: ______________________________

 LO 1.3
• Look carefully at: 1 ; 1 1 ; 21 ; 31 ; 41 ; 51 ; 61 ; 71 ; 81 ; 91

Which numbers come under 5 and 9 ?

5 : 15 ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; 95

9 ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; 99

• Count in tens. Now begin with:

3 ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; 93

• Count backwards in tens:

93 ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; _____ ; 3

 LO 1.11

Bonny and Tommy have made these “tens bugs”.

• The two circles connecting them are equal to 10.

3 + 7 = 10 7 + 3 = 10

• Fill in the missing numbers.
• Complete:

7 and 3

____ and 9

____ and 5

3 and 7

9 and ____

5 and ____

____ and 8

____ and 6

8 and ____

6 and ____

Let’s say that 10 ’s 3 breaks off, then 7 remains.

Number sentence: 10 - 3 = 7

If 10 ’s 7 breaks off, then 3 remains.

Number sentence: 10 - 7 = 3

• Think!

Always think of the two parts!

 LO 1.8
• Help Bonny and Tommy to add all the numbers on the cards as quickly as possible. Can you think of a quick way? Show what you are doing.
 Total: Do these:
• The ripe apples are equal to 10. Only colour the ripe apples.
 LO 1.8
• Bonny says:

Complete the patterns.

• Tommy says:

Complete these patterns.

 LO 2.2
• Use your own method to solve the problem. You may draw as well.

Divide 30 smarties among Bonny and Tommy and their friend, Terry, so that they all get the same number. How many smarties will each one get?

• Each will get ___________________________________________________
 LO 1.7

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 1.3: We know this when the learner knows, reads and writes number symbols and names from 1 to at least 1 000;

Assessment Standard 1.7: We know this when the learner solves and explains solutions to practical problems that involve equal sharing and grouping and that lead to solutions that also include unitary and nonunitary fractions (e.g. 1¼1 , ¾4);

Assessment Standard 1.8: We know this when the learner can perform calculations, using appropriate symbols, to solve problems involving:

1.8.1 addition and subtraction of whole numbers with at least 3 digits;

1.8.2 multiplication of at least whole 2-digit by 1-digit numbers;

1.8.3 division of at least whole 2-digit by 1-digit numbers;

• estimation;

Assessment Standard 1.9: We know this when the learner performs mental calculations involving:

1.9.1 addition and subtraction for numbers to at least 50;

1.9.2 multiplication of whole numbers with solutions to at least 50;

Learning Outcome 2: The learner will be able to recognise, describe and represent patterns and relationships, as well as to solve problems using algebraic language and skills.

Assessment Standard 2.2: We know this when the learner copies and extends simple number sequences to at least 1 000.

Questions & Answers

what does nano mean?
Anassong Reply
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?
Damian Reply
absolutely yes
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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 ?
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
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
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
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
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
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor 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 3. OpenStax CNX. Oct 14, 2009 Download for free at http://cnx.org/content/col11128/1.1
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