IS-171
Computing With
Spreadsheets
Gaining proficiency
Week 2

Gaining Proficiency
 Finished Budget example
 Isolating assumptions
 Cell addressing
 Formatting
 Operator precedence
 Web Integration
 Date Arithmetic
Fred Ferwerda 4/11/2020
2

Finished Budget Example
 Add a row
 Different formulas to compute totals
 Isolate assumptions
 Relative vs. Absolute addressing
Fred Ferwerda 4/11/2020
3

Isolating Assumptions
 Isolate means putting the value in a clearly marked cell
 Makes it explicit to spreadsheet reader
 Only have to change it in one place
 Isolate any value which is not immediately obvious when looking at the spreadsheet
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4/11/2020 Fred Ferwerda

Cell Addressing
 Relative – so many cells over and down/up
 Absolute – that particular cell
 Mixed – so many columns over but that particular row, or so many rows over, but that particular column
Fred Ferwerda 4/11/2020
5

Copy and Move
 Copy updates references according to new location
 Move (cut and paste) updates references only if needed.
 Watch out for moves since they can affect so many cell formulas.
 Fill Handle
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4/11/2020 Fred Ferwerda

Formatting
 Column/Row width
 Format Cells
 Selecting Cells (shift vs. control)
 Format painter (paintbrush icon)
Fred Ferwerda 4/11/2020
7

Operator Precedence
 What is the value of the following expressions?
1+2-3 (1+2)-3 1+(2-3)
1+2*3
-1 + 2
(1+2)*3
-(1 + 2)
1+(2*3)
1+2^3 (1+2)^3 1+(2^3)
Fred Ferwerda 4/11/2020
8

Highest
Lowest
: ,
-
%
^
* /
+ –
Operator Precedence
(memorize)
Colon, comma, and space
Negation
Percent
Exponentiation
Multiplication and division
Addition and subtraction
&
= < > <= >= <>
String concatenation
Comparison operators
Fred Ferwerda 4/11/2020
9

Web Integration
 Hyperlinks
 Save as Web Page
 Round-trip HTML
 Directory of Support Files
 Web Queries
 Import
 Refresh
Fred Ferwerda 4/11/2020
10

Date Arithmetic
 =Today()
 Number of days
 Years = days / 365.24
Fred Ferwerda 4/11/2020
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