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5. Calculate how much wire-netting you will need to go right round the hen-run. (You do not need a gate; you can step over.)

6. Challenge: Make a model of your hen-run. You may even make it to scale. Ask your educator to help you. (Use a simple scale, e.g. 1 cm =1 m).


1. Complete the following:

  • 6 578 g = ____________kg
  • 5,703 km = ______________ m
  • 6 712 ml = ______________litres
  • 7 68 mm = _______________ m
  • 34 mm = _______________________m (5)

Solve the following sums and write down all the steps of your calculations:

2. 87 mm + 4 568 mm + 1,250 m (answer in metres)

3. An ant runs round the edge of a book that is 15 cm wide and 21,5 cm long. How far does the ant run?

4. Peter drinks 250 ml of water after a tennis match and then the coach gives him 350 ml of orange juice. How much liquid does he drink altogether?

5. The mass of a van is 2 250 kg when it is empty. Sixteen bags of oranges each with a mass of 15 kg are loaded onto the van. What is the mass of the van and its load together? (4)

6. Mother has 5 kg of flour. She uses three and a half kg of it. How much flour is left? (2)


LO 4
measurementThe learner will be able to use appropriate measuring units, instruments and formulae in a variety of contexts.
We know this when the learner:
4.1 reads, tells and writes analogue, digital and 24-hour time to at least the nearest minute and second;
4.2 solves problems involving calculation and conversion between appropriate time units including seconds, minutes, hours, days, weeks, months and years;
4.3 uses time-measuring instruments to appropriate levels of precision, including watches and clocks;
4.4 describes and illustrates ways of measuring and representing time in different cultures throughout history;
4.5 estimates, measures, records, compares and orders two-dimensional shapes and three-dimensional objects using S.I. units with appropriate precision for:
  • mass using grams (g) and kilograms (kg);
  • capacity using millilitres (ml) and litres (l);
  • length using millimetres (mm), centimetres (cm), metres (m) and kilometres (km);
4.6 solves problems involving selecting, calculating with and converting between appropriate S.I. units listed above, integrating appropriate context for Technology and Natural Sciences;
4.7 uses appropriate measuring instruments (with understanding of their limitations) to appropriate levels of precision including:
  • bathroom scales, kitchen scales and balances to measure mass;
  • measuring jugs to measure capacity;
  • rulers, metre sticks, tape measures and trundle wheels to measure length;
4.8 investigates and approximates (alone and/or as a member of a group or team):
  • perimeter, using rulers or measuring tapes.


ACTIVITY 1 measuring

  1. Mass

1.1 500 g (or other sizes)

1.2 (a) 500 g; (b) cornflakes; (c) depends on size; (d) 250 g

1.3 (a) own; (b) own (2,5 g); (c) 2,5 g; (d) own


Object My estimation Actual measured mass
Tea-bag own 2,5 g
Margarine own 500g (or other)
Brick own About 3 kg
Me own Own

2. Length and Distance

2.1 to 2.7 Recordings:

Item Estimation Actual Measurement
Head own Own
Friend’s head
Tall person: height
Thumb-nail: width
Longest finger: length


Item Estimation Actual Measurement
Height of door own 2m
Width of window They vary
Length of corridor
Distance to Office
Length of rugby-field
Width of soccer-field

(The size of school sports-fields are smaller than ones for adults.)

3. Measuring Capacity

Item Estimation Actual Measurement
Bucket own Usually 5 or 10 or 15
Cool drink tin Depends on size of tin
Cool drink tins in a litre packet
Tea-spoon 5 ml
Tea-spoons in a titre packet 200
Baby’s bath Depends
My bath
School swimming-pool

Pools differ in size

  • Practical (colouring matter does not give flavour)

ACTIVITY 2 problems using S.I. units


Month Rainfall in ml that month Total for that month
January 17,4
March 58,6
April 30,5
June 17,0
July 60,4

1.2 oral

1.3 yes

1.4 5 ml

1.5 half

1.6 February and May

1.7 autumn according to these figures – 89,1ml then; 77,4ml in winter so far, but the rainfall for August has not been included. (It is actually a winter rainfall area.)

1.8 123,5 ml

2.1 Gary 2.2 4,6 m is the longest jump.

3. 5 958 km

4. 380,9 km

5. 7,17 kg

ACTIVITY 3 perimeter – practical investigation

1 to 6 Own practical measurement and recording


1.1 6,578 kg

1.2 5 703 m

1.3 6,712 liter

1.4 0,768 m

1.5 3,4 cm

1. 5,905 m

2. 73 cm

3. 600 ml

4. 2 490 kg

5. 1,5 kg

Questions & Answers

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
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
characteristics of micro business
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 ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Berger describes sociologists as concerned with
Mueller Reply
Read about ancient clocks like_ hour glass, water clock and sun dial for a quiz and hand on Activity in the class
Neha Reply

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Source:  OpenStax, Mathematics grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11101/1.1
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