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CBSE · Class 6
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Chapter 5
Prime Time
26 videos in this chapter
Understand a factor through equal groups
2 videos
Chapter 5
Factors make exact groups
3:32
Factors make exact groups
You'll learn: Connect a factor to division without leftovers
Chapter 5
Find all factor pairs
3:27
Find all factor pairs
You'll learn: List factors systematically
Understand a multiple through repeated groups
2 videos
Chapter 5
Multiples count repeated groups
3:32
Multiples count repeated groups
You'll learn: Generate positive multiples by repeated equal additions
Chapter 5
Factors and multiples answer different questions
3:44
Factors and multiples answer different questions
You'll learn: Choose the correct relationship in context
Find common factors
2 videos
Chapter 5
One group size for two collections
3:29
One group size for two collections
You'll learn: Find factors common to two numbers
Chapter 5
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
Find common multiples
2 videos
Chapter 5
When do repeated steps meet
3:40
When do repeated steps meet
You'll learn: Find common positive multiples
Chapter 5
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
Distinguish primes composites and one
2 videos
Chapter 5
Prime numbers have exactly two factors
3:36
Prime numbers have exactly two factors
You'll learn: Distinguish prime and composite numbers
Chapter 5
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
Identify primes systematically
2 videos
Chapter 5
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
Chapter 5
Check a proposed prime carefully
3:30
Check a proposed prime carefully
You'll learn: Use factors and counterexamples instead of appearance
Understand coprime numbers
3 videos
Chapter 5
Coprime describes a pair
3:26
Coprime describes a pair
You'll learn: Recognise two numbers sharing only factor one
Chapter 5
Composite numbers can be coprime
3:38
Composite numbers can be coprime
You'll learn: Distinguish coprime pairs from pairs of primes
Chapter 5
Coprime steps make a thread pattern
3:28
Coprime steps make a thread pattern
Build and interpret prime factorisation
4 videos
Chapter 5
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
Chapter 5
Different trees give the same prime collection
3:47
Different trees give the same prime collection
You'll learn: Check factorisation by multiplying back
Chapter 5
Use prime tiles to check coprimality
3:42
Use prime tiles to check coprimality
Use and explain supported divisibility tests
4 videos
Chapter 5
Divisibility by two five and ten
3:35
Divisibility by two five and ten
You'll learn: Connect last-digit rules to place-value groups
Chapter 5
Why the last two digits decide divisibility by four
3:38
Why the last two digits decide divisibility by four
You'll learn: Use hundreds as complete groups of four
Chapter 5
Why the last three digits decide divisibility by eight
3:47
Why the last three digits decide divisibility by eight
Use factors and primes in number puzzles
3 videos
Chapter 5
One number can be special in several ways
3:49
One number can be special in several ways
You'll learn: Justify different valid classifications
Chapter 5
Build a prime product grid
3:43
Build a prime product grid
You'll learn: Use prime factors to meet row and column conditions
Chapter 5
Explore perfect numbers and twin primes
3:48
Explore perfect numbers and twin primes
You'll learn: Explore repeated jumps around a finite peg circle
You'll learn: Find shared prime factors systematically
Chapter 5
Use prime tiles to check divisibility
3:42
Use prime tiles to check divisibility
You'll learn: Check that the divisor’s factors are all available
You'll learn: Use thousands as complete groups of eight
Chapter 5
Choose the right test and explain it
3:42
Choose the right test and explain it
You'll learn: Apply the supported tests without confusing their rules
You'll learn: Recognise the chapter’s special-number examples