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CBSE · Class 6
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Chapter 3
Number Play
22 videos in this chapter
Identify supercells and describe neighbours
3 videos
Chapter 3
Numbers can describe a position
3:20
Numbers can describe a position
You'll learn: Interpret a count of taller neighbours
Chapter 3
A supercell beats its neighbours
3:21
A supercell beats its neighbours
You'll learn: Identify a local maximum rather than the largest number everywhere
Chapter 3
Supercells in a grid
3:25
Supercells in a grid
You'll learn: Apply the stated adjacency rule in two dimensions
Place and compare numbers on a line
2 videos
Chapter 3
A number line needs equal steps
3:26
A number line needs equal steps
You'll learn: Connect equal distances to equal numerical increments
Chapter 3
Find missing numbers from reference marks
3:35
Find missing numbers from reference marks
You'll learn: Infer the step size and locate values
Explore digit sums
3 videos
Chapter 3
A number and its digit sum are different
3:33
A number and its digit sum are different
You'll learn: Separate place value from adding digits
Chapter 3
Build numbers with a chosen digit sum
3:26
Build numbers with a chosen digit sum
You'll learn: Use constraints to compare possible numbers
Chapter 3
Count appearances of a digit
3:32
Count appearances of a digit
Recognise and construct palindromes
2 videos
Chapter 3
Numbers that read the same both ways
3:29
Numbers that read the same both ways
You'll learn: Recognise and build palindromes
Chapter 3
Reverse add and test again
3:35
Reverse add and test again
You'll learn: Follow a repeated number transformation accurately
Explore the Kaprekar routine
2 videos
Chapter 3
Rearrange subtract and repeat
3:35
Rearrange subtract and repeat
You'll learn: Follow the four-digit routine with valid starting digits
Chapter 3
Different starts can meet the same result
3:48
Different starts can meet the same result
You'll learn: Compare selected trajectories and recognise a fixed result
Find number patterns in clocks and calendars
1 video
Chapter 3
Clock and calendar digit puzzles
3:30
Clock and calendar digit puzzles
You'll learn: Find patterns within the chosen display convention
Use mental arithmetic and spot patterns
3 videos
Chapter 3
Regroup to make a friendly calculation
3:34
Regroup to make a friendly calculation
You'll learn: Explain mental addition and multiplication
Chapter 3
An operation changes more than the digits
3:38
An operation changes more than the digits
You'll learn: Reason about possible result sizes
Chapter 3
Always sometimes or never
3:40
Always sometimes or never
Explore the Collatz process
2 videos
Chapter 3
Two rules create a number journey
3:28
Two rules create a number journey
You'll learn: Apply half for even numbers and three times plus one for odd numbers
Chapter 3
Examples leave a bigger question
3:42
Examples leave a bigger question
You'll learn: Understand what an unproved conjecture means
Estimate quantities sensibly
2 videos
Chapter 3
Estimate using a small count
3:37
Estimate using a small count
You'll learn: Use representative groups to estimate a larger quantity
Chapter 3
Choose a sensible scale for an estimate
3:33
Choose a sensible scale for an estimate
You'll learn: Check whether a result is plausible
Explore games and winning strategies
2 videos
Chapter 3
Work backwards in a counting game
3:32
Work backwards in a counting game
You'll learn: Find useful target totals for adding one two or three
Chapter 3
Change the rules and rethink the strategy
3:40
Change the rules and rethink the strategy
You'll learn: Adapt reasoning when the target or allowed move changes
You'll learn: Count occurrences rather than just numbers containing the digit
You'll learn: Support a claim or find a counterexample