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Mathematics

Grade 5

Multiplication and division

Module 32

Multiplication

Activity 1:

To recognise and represent the multiples of single-digit numbers [lo 1.3.6]

I think you already know how important it is to know your tables well. In this learning unit it will help you to multiply quickly and correctly. Let us see how well you know your tables.

1. Take the fruit-shaped sweets containing the correct answers out of the jar. Colour them in neatly and then write down the letter of the alphabet written on it. Use these letters to complete the sentence:

_____________ is a shorter way of doing repeated addition.

1.1 5 × 4

1.2 2 × 3

1.3 7 × 7

1.4 7 × 4

1.5 5 × 5

1.6 7 × 3

1.7 6 × 4

1.8 9 × 2

1.9 9 × 7

1.10 9 × 9

1.11 7 × 6

1.12 3 × 5

1.13 8 × 8

1.14 12 × 4

1.15 6 × 12

1.16 9 × 12

1.17 6 × 6

Activity 2:

To recognise and represent the factors of at least any two-digit whole number [lo 1.3.7]

1. Now that you know exactly what factors are, you are probably able to see their important function in multiplication. Factors also help us to test our answers when we multiply. Yes, you are right! We use them when we divide in order to test whether we have multiplied correctly. Now see how many pairs of factors you can write down for the following numbers.

a) 24 = ............ × ............ b) 36 = ............ × ............
= ............ × ............ = ............ × ............
= ............ × ............ = ............ × ............
= ............ × ............ = ............ × ............
= ............ × ............

2. Let us do some more exercises, using factors. Look at the products (numbers) and then write down suitable factors for them. The first one has been done for you.

42 45 63 54 64
7 × 6 ...................... ...................... ...................... ....................................
72 108 48 88 96
...................... ...................... ...................... ...................... ....................................

DO YOU STILL REMEMBER?

When you multiply any number by 0 , the answer is always 0 . (0 × 6 = 0)

Any number multiplied by 1 , is that number. (9 × 1 = 9)

Activity 3:

To be able to do mental arithmetic [lo 1.9.2]

Now the factors are supplied to you. All you have to do in your first mental arithmetic test is to complete the multiplication block by writing down the missing answers only. Easy, isn’t it?

X 4 5 6 7 8 9 12
5 20 ............ 30 ............ 40 ............ 60
6 ............ 30 36 42 ............ 54 ............
7 28 ............ 42 ............ 56 ............ 84
8 ............ 40 ............ 56 ............ 72 ............
9 ............ ............ 54 ............ 72 ............ 108
2 48 60 ............ 84 ............ 108 ............

Activity 4:

To describe and illustrate different ways of writing in different cultures [lo 1.2]

By doubling numbers we can find the answer to a multiplication sum much more easily. Here we can learn from the Egyptians. Work with a friend and see whether you are able to find out how this calculation was done.

28 × 324

1 × 324: 324 (1 × 324)
Double 324: 648 (2 × 324)
Double l 648: 1 296 (4 × 324)
Double 1 296: 2 592 (8 × 324)
Double 2 592: 5 184 (16 × 324)
Thus: 28 × 324 = 9 072

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
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?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
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 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 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10994/1.3
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