2017
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Intermediate Phase (Grade 4, 5 & 6)Educator GuideMathematics
The value of our electricity
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A BPicture A Picture B
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Picture A Picture B
1. Uses energy-saving lights
2. The bin is empty
3. The lady is smiling
4. The bill is low
5. The temperature is low
6. Open curtain - using natural light
7. The light is off in the morning (8am)
8. Uses old light bulbs
9. The bin is full
10. The lady is sad
11. The bill is high
12. The temperature is high
13. Closed curtain - not using natural light
14. The light is on in the morning (8am).
2.1 How much is the electricity account in picture A? [R254]
2.2 How much is the electricity account in picture B? [R723]
2.3 Work out the difference between the electricity accounts. [R723 - R254 = R469].
2.4 Give reasons why the amounts on the electricity accounts are different? [The lady in picture A: is using energy-saving lights - her account is lower; she is practising being energy-wise by using natural light (window); the lights are off at 8.00am].
3. Do you think the lady in picture B is doing the right thing by leaving the lights on until 8.00am? Give reasons for your answer. [Listen to the learners views; you could add that she is not using energy-saving habits].
4. Give2differencesbetweentheenergy-savinglight(compactfluorescentlight-CFL)andtheoldlightbulb(incandescentlight)?[CFL-givesofflessheat/lastslonger;oldlightbulb-givesoffmoreheat/doesnotlastaslongasaCFL].
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Number of energy-saving lights used for the month
ElectricityAccount
1energy-savinglight(CFL) R52energy-savinglights(CFLs) R103energy-savinglights(CFLs) R154energy-savinglights(CFLs) R205energy-savinglights(CFLs) R256energy-savinglights(CFLs) R30
Number of old light bulbs used for the month
ElectricityAccount
1 old light bulb R10 2 old light bulbs R20 3 old light bulbs R30 4 old light bulbs R40 5 old light bulbs R50 6 old light bulbs R60
A BPicture A Picture B
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Number of energy-
saving lights1 2 3 4 5 6
Cost
R5 R10 R15 R20 R25 R30
Cost of using energy-saving lights. One unit = R5
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Number of old light bulbs used for the month Electricity account1 old light bulb R10
2 old light bulbs R203 old light bulbs R304 old light bulbs R405 old light bulbs R506 old light bulbs R60
1 2 3 4 5 6
R50
R60
R70
R40
R30
R20
R10
R0
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Type of bulb Tally Marks No.
Old light bulbs 18
Energy-saving lights
6
Energy-saving lights
Old light bulbs
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Survey: Television (TV)
Date of survey: 23 November 2013Survey Conducted by: Jabu MpsheGrade: 6
Total number of learners in class: 40
No. Item Number Percentage1. How many learners are there in class? 40 100%2. How many learners have a television (TV) at home? 30 75%3. How many learners do not have a television (TV) at home? 10 20%
4.How many learners switch the television (TV) on and off using the remote control?
18 45%
5.How many learners switch the television (TV) on and off using the switch on the television (TV)?
4 10%
6.How many learners switch the television (TV) on and off sometimes using the switch on the television (TV) and sometimes with the remote?
8 20%
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18
4
8
02468
101214161820222426283032
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Appliance Time left on for the day Energy used Cost
Fridge 24 hours 2/6 R16TV on standby (switched off with the remote control)
24 hours 1/6 R8
Geyser 24 hours 3/6 R24
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Cost of using appliances R2
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Month July August September Total
Account R600 R400 R200 R1200
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