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| | |type= Lesson idea |
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| <center>'''Teacher Notes'''</center>
| | |attribution={{MarkDawes}} |
| | |subject=Maths |
| | |resourcenumber= M002 |
| | |final=yes |
| | |age= KS4, KS3, age 12-16, 6th form as a recap, Secondary |
| | |title=An Introduction to the Standard Index Form |
| | |topic=Standard Index Form |
| | |tagline=Working out the rules according to which a calculator displays large numbers |
| | |image= StdIndexFormE.png |
| | |content= Numbers that are too big for the calculator's 10-digit display are shown in standard index form. Many calculators now use ×10n but older calculators may use ‘E’ in the display instead. This activity is for secondary school pupils who are unfamiliar with standard index form. It is an intriguing one hour investigation where pairs of students explore the way a calculator converts numbers. They may well find out how it works for themselves. |
| | |format= |
| | |strategy= |
| | |additional resources=This was written for use with TI-82 Graphical Calculators, but new scientific calculators can also be used. |
| | |Learning Objectives=Students should be able to: |
| | * convert numbers between standard index form and ordinary form, |
| | * recognise whether a number is in standard index form or not. |
| | |useful information= |
| | |related resources= |
| | |other=This activity will take at least an hour. |
| | |resources= The [[Introduction to standard index form/Teacher Notes]] contains teacher notes, a PowerPoint presentation and an Excel worksheet to be used for an activity on numbers in the solar system. All three files are also available to download:<br /> |
| | * [[file:introduction to standard index form - teacher notes.doc]], |
| | * [[file:standard index form.ppt]], |
| | * [[file:solar system data.xls]]. |
| | }} |
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| <center>'''Topic: '''Introduction to Standard Index Form</center>
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| | | [[Category:Maths]] [[Category:Secondary]] [[Category:ORBIT]] |
| '''Original Author: '''Mark Dawes
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| '''Type of Lesson/length:''' Investigation and Discussion. Work in pairs. 45 minute lesson
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| '''Age/Level/Key Stage''': Years 7-9, KS3
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| '''Learning objectives'''
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| By the end of this lesson students should be able to:
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| '''Pedagogical rationale/strategy'''
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| ''This needs to be written...''
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| '''Resources required'''
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| This was originally written for use with TI-82 Graphical Calculators, but nowadays new scientific calculators can also be used.
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| '''Differentiation/student ability/sets'''
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| ''State them here if known/identified''
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| '''Background'''
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| This is for pupils who haven’t yet been introduced to standard index form and is a way for them to be intrigued by it and to work out for themselves how it works.
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| '''Important facts'''
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| On modern scientific calculators numbers that are too big or too small for the 10-digit display are shown in standard index form. Most such calculators now use ×10<sup>''n''</sup> but older calculators might use ‘E’ in the display instead.
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| If a calculator is in ‘scientific mode’ it will display all numbers in standard index form.
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| '''About the lesson Plan'''
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| Display the first slide and ask the pupils what each of the sets of numbers have in common.
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| The first set all have 1 significant figure, the second have 2 sig figs, etc. The pupils are likely to find this difficult.
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| Then ask them to put their calculator into Scientific Mode. If the school has sets of scientific or graphical calculators then these can be set up in the right mode in advance.
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| The pupils should start only with numbers with 1sf and should type them in and then press ‘<nowiki>=</nowiki>’. They should then choose other 1sf numbers, should predict what the calculator will show and then type them in. At this stage they are probably best to stick to big numbers.
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| In the discussion that follows there are likely to be lots of ways to explain what is going on.
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| '''Common misconceptions'''
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| Next, ask what they think ''might'' happen if they type a number with 2sf. Usually they assume that it will have two digits and that the index will denote the number of zeroes. They should now try some on their calculators and produce a new theory.
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| The pupils can then move on to other numbers of significant figures, until they have got a way of describing how to predict what the calculator will do with ''any'' big number.
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| '''Extension/follow up lesson'''
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| I usually return to the calculators in a subsequent lesson to deal with numbers that are less than 1.
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| '''Resources'''
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| The worksheet of solar system data allows the pupils to write some numbers in standard index form, to do some conversions and to see the point of using standard index form.
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| The worksheet has some other interesting features for the pupils to discover/wonder about. For example, Pluto is included even though it is no longer regarded as a planet (by definition it is now a ‘Plutoid’). The distances of the objects from the sun are averages: why? <nowiki>[They</nowiki> do not have circular orbits – which is a common misconception.] The moon does not have a distance given – because its average distance from the sun is the same as that of the earth (why?).
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| '''Maths issue'''
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| There is only one rational number that cannot be written in standard index form – that is zero (why?).
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| There is then a definition to show the pupils at the end of the lesson.
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| '''Resource set up'''
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| * Graphical Calculator Investigative Introduction <nowiki>[OHT]</nowiki> Working in pairs (with one calculator or two), turn on, press mode (top left), the right arrow (so that sci is flashing) and enter, followed by quit (press 2nd and then mode). The calculator will now change all numbers into standard form (using 4E7 notation to stand for 4 x 10<sup>7</sup> ).
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| * Can they predict what certain numbers put up on the w/b will be displayed as?
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| * Calculator uses 4E7 – this is because it can’t write them properly as 4 x 10<sup>7</sup> - we have to write them this way.
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| * Write some of the numbers on the w/b using correct notation.
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| Solar System Worksheet: Fill in empty columns and put the masses in ascending order.
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| '''Assessment/ homework opportunities'''
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| '''Follow up/ where to next?'''
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| '''Links to other resources'''
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| '''Other methods of teaching the same topic'''
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| [[Category:Maths]] [[Category:Secondary]] | |
