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Why the last three digits decide divisibility by eight

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Prime Time · Use and explain supported divisibility tests · 3:47

You'll learn: Use thousands as complete groups of eight

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Why the last three digits decide divisibility by eight

3:47

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Why the last three digits decide divisibility by eight

You'll learn: Use thousands as complete groups of eight

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Use and explain supported divisibility tests

3

Divisibility by two five and ten
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Divisibility by two five and ten
You'll learn: Connect last-digit rules to place-value groups
Why the last two digits decide divisibility by four
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Why the last two digits decide divisibility by four
You'll learn: Use hundreds as complete groups of four
Choose the right test and explain it
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Choose the right test and explain it
You'll learn: Apply the supported tests without confusing their rules

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Use factors and primes in number puzzles

3

One number can be special in several ways
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One number can be special in several ways
You'll learn: Justify different valid classifications
Build a prime product grid
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Build a prime product grid
You'll learn: Use prime factors to meet row and column conditions
Explore perfect numbers and twin primes
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Explore perfect numbers and twin primes
You'll learn: Recognise the chapter’s special-number examples

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Understand perimeter

2

Perimeter is a journey around the edge
3:34
Perimeter is a journey around the edge
You'll learn: Distinguish boundary length from surface coverage
Count every boundary side once
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Count every boundary side once
You'll learn: Calculate the perimeter of an irregular straight-sided shape

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Explain rectangle and square perimeter methods

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A rectangle repeats two side lengths
3:23
A rectangle repeats two side lengths
You'll learn: Derive perimeter by adding the four sides
A square repeats one side four times
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A square repeats one side four times
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Equal-sided polygons follow the same idea
3:47
Equal-sided polygons follow the same idea
You'll learn: Use the number of equal sides in a perimeter calculation

Next topic

Solve boundary and missing side problems

2

Find a missing boundary length
3:55
Find a missing boundary length
You'll learn: Use known sides and the perimeter total
Read a fencing problem carefully
3:46
Read a fencing problem carefully
You'll learn: Distinguish full perimeter from the material actually needed

Next topic

Understand area and square units

2

Area measures coverage
3:41
Area measures coverage
You'll learn: Cover a region without gaps or overlaps
The unit square changes the count
3:40
The unit square changes the count
You'll learn: Connect unit size to the numerical area measure