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Mathematics

Grade 5

Measurement and time

Module 51

Length

In this learning unit we shall be looking at different units used to measure length, as well as at the importance of measuring accurately.

Activity 1:

  • To measure and record [LO 4.5.3]
  • To measure accurately with the appropriate measuring instruments [LO 4.7.3]

1. Let us start right away! How well do you know yourself? Measure the following as accurately as possible (your friend may help you):

1.1 the length of your thumb nail

1.2 the length of your little finger

1.3 the length of your right foot

1.4 the length of your left arm from your shoulder to the tip of your middle finger

1.5 How tall are you?

1.6 How high can you reach when you jump up from the ground?

1.7 How much higher is this than your height?

2. What did you use to measure the above?

3. What other measuring apparatus could we also use to measure length?

Do you still remember?

1 cm = 10 mm

1 m = 100 cm

1 m = 1 000 mm

1 km = 1 000 m

Did you know?

  • One metre is roughly the distance from an adult’s nose to the tip of his middle finger on his stretched out hand.
  • The length of a fingernail is roughly 1 cm.
  • The length of a hand is roughly 10 cm.
  • The space underneath your fingernail is roughly 1 mm.
  • The breadth of a little finger is roughly 10 mm.

4. Work together with a friend and complete the following table.

Measure Estimate Actual Measurement Difference
a) the height of your educator ...................... ....................... .......................
b) the breadth of your classroom ...................... ....................... .......................
c) the height of your desk/table ...................... ....................... .......................
d) the total length of the blackboard in the classroom ...................... ....................... .......................

Activity 2:

To solve problems that include selecting, calculating with and converting standard units [lo 4.6]

1. It is important for us to know which measuring units are used for specific lengths. In order to do that correctly, we must know exactly how long the different measuring units are. Let us see how good you are at this! Choose a suitable unit to measure the following:

1.1 The chest size of Dad’s suit (of clothes) is 102 ____

1.2 The height of my bedroom wall is 4 ____

1.3 The breadth of the stoep of the farmhouse is 2,5 ______

1.4 The thickness of my dictionary is 40 _____

1.5 The distance between Johannesburg and Cape Town is more than 1 000 _____

1.6 The depth of the water in our swimming pool is 1,500 _____

2. Circle the measurement that is the closest to reality:

2.1 Our classroom door is about ____high.

(a) 20 m

(b) 200 mm

(c) 2 km

(d) 2 m

2.2 My foot is about ____long.

(a) 26 cm

(b) 26 mm

(c) 26 km

(d) 26 m

2.3 The distance from Durban to East London is ____

(a) 674 mm

(b) 674 km

(c) 674 m

(d) 674 cm

3. Let us look at the way of writing length in the decimal form:

We already know that 10 mm = 1 cm

Thus: 25 mm = 10 + 10 + 5 mm= 1cm + 1 cm + 5 mm= 2 cm + 5 mm= 2,5 cm of 2 1 2 size 12{ { { size 8{1} } over { size 8{2} } } } {} cm

Complete the table:

Number of mm 10 85 ............ 245 ............ 1 026 ............
Number of cm 1 ............ 4,2 ............ 17,9 ............ 146,3

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
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
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
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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