1 U7 Spreadsheet Operations II (Optional) Presented by: Law Hing Man (11 Dec 2001)
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Transcript of 1 U7 Spreadsheet Operations II (Optional) Presented by: Law Hing Man (11 Dec 2001)
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7.1 Overview of Using Spreadsheet as a Teaching and Learning tool
• Spreadsheet is not just a tool for handling marks and statistics.
• Spreadsheet can be used in teaching and learning.
• By using charts, auto-recalculation and macro, spreadsheet can be used to develop an Interactive Learning Environment (ILE).
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7.2 Creating and Formatting ChartsSteps to create a chart (Example1)Step1: Select the data to be included in the chart
(Including column and row labels)
Step2: Click the Chart wizard button (or select Insert -> Chart…)
Step 2
Step 1
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Step6: Select the location of your chart.
(either as a new sheet or as an object in an existing worksheet)
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7.3 Spreadsheet as a “What-if” Analysis Tool
• “What-if”What will happen to that if I change this.
• Example 2Mortgage repayment analysisPMT(r,nper,loan) calculates the periodic payment of a loan where
r : Interest rate per periodnper : Number of paymentsloan : The amount of loan
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A B
1 loan 2,000,000.00
2 Interest rate (p.a.) 3.00%
3 number of years 20
4 monthly payment 11,091.95
=-PMT(B2/12,B3*12,B1)
variables
By changing different variables, we will get different results.
What is the minimum number of years if one can only afford $10000 monthly repayment?
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Example 3 – Mark Adjustment
A B C D E
1 Name Test1 Test2 Term Mark
2 MARY 21 45
3 PETER 45 76
4 JOHN 56 34
5 HELEN 43 65
6 KITTY 45 56
=(B2+C2)/2
If we want to adjust the marks by multiplying a weight, we can change the cell D2 to =(B2+C2)/2*$E$1 and put a weight to E1.
Copy
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Relative Address
• A relative address in a formula is the location of the specified cell or range relative to the cell that contains the formula.
• If you copy a formula that contains a relative address, Excel adjusts the address to reflect the new location.
• For example, if you type =A2 in A4, it means “2 cells up”. If you copy the contents of A4 to B5, the contents of B5 will be =B3, still “2 cells up”.
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Absolute Address• An absolute address in a formula (specified
by “$” before both column letter and row number in the cell address) is the specified range or cell address.
• If you copy a formula that contains an absolute address, the address does not change.
• For example, if you type =$A$2 in A4, it means A2. If you then copy the contents of A4 to B5, the contents of B5 will still be =$A$2.
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Mixed Address• A mixed address in a formula is an
address that contains both relative and absolute references.
• If you copy a formula that contains a mixed address, Excel adjusts the relative part, but not absolute part.
• For example, if you type =$A2 in A4, column A is absolute and row 2 is relative. If you then copy the formula from cell A4 to B5, the contents of B5 will be =$A3.
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Challenge Problem 1
* Construction of a multiplication table.a) Fill the numbers 1 to 10 into range A2 to A11b)Fill the numbers 1 to 10 into range B1 to K1c) Enter a formula in B2 (? Formula)d)Copy the formula in c) to the range B2 to K11 to complete the table.
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Challenge Problem 2* Construction of a mortgage table.
a) Fill the numbers 2.00% to 4.00% (interval=0.25%) into range A2 to A10.b) Fill the numbers 5 to 30 (interval=5) into range B1 to G1c) A1 stores the loan (say 100,000)d) Enter a formula in B2 (? Formula)e) Copy the formula in c) to the range B2 to G10 to complete the table.
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A B C D E F G
1 100,000 5 10 15 20 25 30
2 2.00%
3 2.25%
4 2.50%
5 2.75%
6 3.00%
7 3.25%
8 3.50%
9 3.75%
10 4.00%
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7.4 Spreadsheet as a Tool for Developing Explorative Learning Environment
• Macro
Macro is a series of commands that Excel carries out automatically.
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Step2: In the Macro Name Box, fill in a name.
Step3: [Optional]Short Cut Key, Store Macro In
Step4: Click the OK button.
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Step5: Carry out the actions that you want to recordStep6: Click the Stop Macro button.
[ To record a Macro with relative address, click the option Relative Reference before Step 5.]
Stop Macro button
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Execute a MacroStep1: Select Tools->Macro->Macro…
Step2: In the Macro Name Box, select a name.
Step3: Click the Run button.
OR Press Short Cut KeyRun button
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Edit a MacroStep1: Select Tools->Macro->Macro…
Step2: In the Macro Name Box, select a name.
Step3: Click the Edit button.
Step4: Make the necessary changes.
Edit button
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Create a Macro By Visual Basic
• Macro is actually written in Visual Basic, so you may create macro by yourself.
• For more information about Simple Visual Basic, you may refer to my homepage.
• For more advanced VB, refer to other references.
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Challenge Problem 3
• Develop an ILE for students learning the relationship between two quantities (say x and y) by using macro.
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Challenge Problem 4• Develop an ILE for solving the following
problem.
A student has $90. He wants to buy hotdogs and drinks. The price for hotdog is $7@ and that for drink is $5@. The number of drinks should be half of the number of hotdogs. What is the maximum number of hotdogs and drinks that the student can buy?