Counting strategies (Edexcel GCSE Maths): Flashcards
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11 cards from this deck
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Practise the cards
11 cards from this deck
What are counting strategies?
What are counting strategies?
Systematic methods to find all possible combinations/arrangements
Why use an organised counting approach?
Why use an organised counting approach?
Ensures no possibilities missed & avoids counting same thing twice
First step of systematic listing method
First step of systematic listing method
Start with first item - list all combinations beginning with it
Second step of systematic listing method
Second step of systematic listing method
Move to second item - list all combinations beginning with it
How many 3-digit numbers from digits 4, 5, 6?
How many 3-digit numbers from digits 4, 5, 6?
6 different three-digit numbers
Badge combinations: 3 colours × 3 shapes = ?
Badge combinations: 3 colours × 3 shapes = ?
9 possible badges
5 teams, each plays every other once. Total matches?
5 teams, each plays every other once. Total matches?
10 matches
What must you show in exam counting questions?
What must you show in exam counting questions?
Your organised method/systematic strategy clearly
What must you state at end of counting question?
What must you state at end of counting question?
The total number of combinations
How to organise your counting list?
How to organise your counting list?
In logical order (alphabetically or numerically)
When counting matches/games, key rule?
When counting matches/games, key rule?
Each pair only plays once