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## by iarthur on Feb 03, 2009

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• Aims of the Lesson 1
• Today’s Lesson
• Note taking
• Columns/Rows
• Simple Formula
• Complex Formula
• Complete Red Folder
• A spreadsheet is an example of a GPP that is used to help you process, store and calculate numbers.
• Columns/Rows
• Columns
• Boxes that go vertically, for example, column A
• Rows
• Boxes that go horizontally, for example, Row 1
• Columns/Rows/Cell Reference Cell E3 Cell A1 Columns Rows
• Simple Formula
• Simple Formula
• Subtraction =A1 - A2
• Multiplication =A1 * A2
• Division =A1 / A2
• Complex Formula
• Complex Formula
• Adding a list of numbers = sum(A1 : A10)
• Calculating Averages = average(A1 : A10)
• Finding the largest = max(A1 : A10)
• Finding the smallest = min(A1 : A10)
• Making Decisions =if(A1>65,”OAP”,”young thing”)
• What is a spreadsheet used for?
• All types of calculations
• When data changes results are usually re-calculated
A B C D 1 2 3 4 5 6 7 8 9 10 11 12 13 A B C D
• Formulae
• Always starts with an equals sign
• For example =A3 + B9
• Symbols used:
• - Subtract
• * Multiply
• / Divide
• Formulae is usually re-calculated when the number in a cell is changed
• SUM
• SUM is a function that spreadsheets use to add up a list of numbers to save typing time.
• For example : =SUM (A2:A8) instead of:
• = A2 + A3 +A4 + A5 + A6 + A7 + A8
• What is the sum equivalent of:
• = B7 + C7 + D7 + E7 + F7 + G7
• Automatic/Manual Calculation
• Automatic – spreadsheet will calculate a formula automatically .
• Most common
• Manual – The result of the formula will not be calculated automatically.
• Insert row/column
• Sometimes you need to add an extra row or column to your spreadsheet to make room for more numbers or formulae.
• A new column will have to be added if the tuck-shop decide to start selling Snickers .
• The new column will be inserted in-between columns B and C.
Insert a new column A B C D 1 2 3 4 5 6 7 8 9 10 11 12 13
• Charting
• Why would you want to create a chart?
• Eye-catching
• Easier to understand at a glance
• Concise
Bar Chart Line graph Pie Chart
• Complex Formulae
• Average e.g.. =Average(B2:B10)
• What will this formula work out?
• Max e.g. = Max(B12:B67)
• What will this formula work out?
• Min e.g. =Min(B2:B10)
• What will this formula work out?
• Replication
• What does it mean?
• Copying - formulae can be copied into different cells to save time
• Relative referencing - formula is changed to match the line that it is on
=B2*C2 =B3*C3 =B4*C4 A B C D 1 2 3 4
• Formatting Centred Left aligned Right aligned Cell attributes - 2 decimal places and formatted to show currency Column width changed
• Cell Protection
• What is cell protection?
• Locking a cell so that the contents can’t be changed
• E.g. locking the formulas in C4 and C5 so that the user can’t accidentally change them.
A B C 1 2 3 4 5
• Formulae using IF (Credit)
• Spreadsheets uses an IF formula to decide what to put in a cell depending on what is in another cell
• For example:
• =IF(B2>50, “PASS”, “FAIL”)
A B C 1 2 3 4
• Relative & Absolute Referencing (Credit)
• What is relative referencing?
• - When a formula is replicated the cell reference is changed to suit the line or column that it is in
• Absolute Referencing (Credit)
• What is absolute referencing?
• When a formula is replicated the cell reference is not changed - it stays exactly the same
• C1 always stays the same, as it uses the \$ signs
A B C A B C 1 2 3 4 5
• Fully Labelled Charting (Credit)
• Label for chart series
• Title
• x-axis and y-axis labelled
• Label for each point on a chart showing relation to data