Number and Bar Scales (Grade 10 NSC Matric Mathematical Literacy): Flashcards
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Practise the cards
10 cards from this deck
Define scale in mapping
Define scale in mapping
Relationship between map distances and real distances
What is a number scale?
What is a number scale?
Ratio like 1:50 showing map units to real units
Formula: Real distance using number scale
Formula: Real distance using number scale
Map distance × Scale factor
What is a bar scale?
What is a bar scale?
Visual ruler with segments showing real distances
Formula: Real distance using bar scale
Formula: Real distance using bar scale
Number of segments × Distance per segment
Advantage of number scales
Advantage of number scales
Simple to use and quick calculations
Disadvantage of number scales when resizing maps
Disadvantage of number scales when resizing maps
Becomes inaccurate if map is resized or photocopied
Advantage of bar scales when resizing maps
Advantage of bar scales when resizing maps
Remains accurate even when map is resized
How to calculate scaled measurement from real size?
How to calculate scaled measurement from real size?
Divide real measurement by scale factor
Critical rule when drawing any scaled map
Critical rule when drawing any scaled map
Always include the scale on the drawing