VaaraVaara Classroom

Videos Practice Progress

Loading video…

Loading…

Loading video…

Regroup to make a friendly calculation

Ask Vaara

Your maths helper for this video

Loading…

Number Play · Use mental arithmetic and spot patterns · 3:34

You'll learn: Explain mental addition and multiplication

Up next

15 videos

Now playing

Regroup to make a friendly calculation

3:34

Playing

Regroup to make a friendly calculation

You'll learn: Explain mental addition and multiplication

Now playing

Same topic

Use mental arithmetic and spot patterns

2

An operation changes more than the digits
3:38
An operation changes more than the digits
You'll learn: Reason about possible result sizes
Always sometimes or never
3:40
Always sometimes or never
You'll learn: Support a claim or find a counterexample

Next topic

Explore the Collatz process

2

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
Examples leave a bigger question
3:42
Examples leave a bigger question
You'll learn: Understand what an unproved conjecture means

Next topic

Estimate quantities sensibly

2

Estimate using a small count
3:37
Estimate using a small count
You'll learn: Use representative groups to estimate a larger quantity
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

Next topic

Explore games and winning strategies

2

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
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

Next topic

Turn a question into a small data collection

2

What do we need to find out
3:30
What do we need to find out
You'll learn: Turn a practical question into collectable responses
Collect data consistently
3:44
Collect data consistently
You'll learn: Record each response once in useful categories

Next topic

Organise observations with tally marks

2

Tallies help us keep count
3:30
Tallies help us keep count
You'll learn: Record observations in groups of five
Turn tallies into a frequency table
3:48
Turn tallies into a frequency table
You'll learn: Read category counts and verify totals

Next topic

Read a pictograph and its key

2

A picture can stand for several objects
3:28
A picture can stand for several objects
You'll learn: Use a key to interpret a pictograph
Half a symbol has a meaning too
3:24
Half a symbol has a meaning too
You'll learn: Read a partial symbol when the key permits it

Next topic

Construct a pictograph

1

Choose a useful pictograph key
3:38
Choose a useful pictograph key
You'll learn: Balance space and accurate representation