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Factors make exact groups

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Prime Time · Understand a factor through equal groups · 3:32

You'll learn: Connect a factor to division without leftovers

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Factors make exact groups

3:32

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Factors make exact groups

You'll learn: Connect a factor to division without leftovers

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Understand a factor through equal groups

1

Find all factor pairs
3:27
Find all factor pairs
You'll learn: List factors systematically

Next topic

Understand a multiple through repeated groups

2

Multiples count repeated groups
3:32
Multiples count repeated groups
You'll learn: Generate positive multiples by repeated equal additions
Factors and multiples answer different questions
3:44
Factors and multiples answer different questions
You'll learn: Choose the correct relationship in context

Next topic

Find common factors

2

One group size for two collections
3:29
One group size for two collections
You'll learn: Find factors common to two numbers
Use common factors to solve a sharing problem
3:44
Use common factors to solve a sharing problem
You'll learn: Interpret the largest possible group size from a list

Next topic

Find common multiples

2

When do repeated steps meet
3:40
When do repeated steps meet
You'll learn: Find common positive multiples
Find the first meeting and later meetings
3:41
Find the first meeting and later meetings
You'll learn: Use a short list to solve a repeated-event problem

Next topic

Distinguish primes composites and one

2

Prime numbers have exactly two factors
3:36
Prime numbers have exactly two factors
You'll learn: Distinguish prime and composite numbers
Why one is different and two is prime
3:34
Why one is different and two is prime
You'll learn: Correct common classification mistakes

Next topic

Identify primes systematically

2

Sift a number grid for primes
3:33
Sift a number grid for primes
You'll learn: Use a systematic sieve on a finite grid
Check a proposed prime carefully
3:30
Check a proposed prime carefully
You'll learn: Use factors and counterexamples instead of appearance

Next topic

Understand coprime numbers

3

Coprime describes a pair
3:26
Coprime describes a pair
You'll learn: Recognise two numbers sharing only factor one
Composite numbers can be coprime
3:38
Composite numbers can be coprime
You'll learn: Distinguish coprime pairs from pairs of primes
Coprime steps make a thread pattern
3:28
Coprime steps make a thread pattern
You'll learn: Explore repeated jumps around a finite peg circle

Next topic

Build and interpret prime factorisation

1

Break a number into prime building blocks
3:27
Break a number into prime building blocks
You'll learn: Continue splitting until every factor is prime