Maths · KS3 Y8 · Statistics

Drawing pie charts

m169Free127:33Heddy Score 2 of 7, below the standard

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What you need to know

Every whole number above 1 is a product of primes in only one way.
A factor tree splits a number until every branch ends in a prime.
Write the result in index form, such as 2³ × 3.

In this clip

4:00–4:43Prime factorisationm26

4:43–7:17HCF & LCM by prime factorsm54

7:17–8:16Inequalities on a graphgcse-math-a22b

9:50–13:30Reverse percentagesm52

13:30–14:50Simple interest and money mathsgcse-math-r9b

14:50–15:50Estimating before calculatingm32

15:50–21:03Compound interestmh12

24:30–26:07Standard form: large numbersm46

26:07–26:52Laws of indicesm41

26:52–27:39Fractional indicesmh6

27:39–29:21The product rule for countinggcse-math-n5b

29:21–31:24Error intervalsmh5

33:13–34:47Expanding a single bracketm61

34:47–36:15Quadratic expressionsmh1

36:15–37:55Factorising into a bracketm66

40:55–41:49Unknowns on both sidesm69

41:49–44:18Rearranging simple formulaem71

45:10–51:25Simultaneous equationsm19

51:25–58:54Building equations from problemsm84

59:32–62:40nth term of linear sequencesm70

65:11–69:03Graphs of quadraticsm85

73:09–77:07Ratio notationm7

81:44–85:49Speed, distance, timem96

87:12–89:56Angles in parallel linesm123

89:56–92:27Angles in polygonsm16

97:23–99:36Bearingsm134

103:16–105:10Enlarging shapesm130

115:12–118:41Venn diagrams for probabilitym157

118:41–122:50Tree diagramsmh17

125:17–127:33Exact trigonometric valuesgcse-math-g21

Also coversDirect proportion y = kxm102

Also coversInverse proportionm103

Also coversArea of a trapeziumm125

Also coversDrawing pie chartsm169

Also coversScatter graphs & correlationm20

Also coversFrequency polygonsmh19

Also coversFrequency treesm159

Also coversDependent eventsgcse-math-p8b

Heddy Score2/7, Below the standard

Trusted source · passed. The creator's own upload, live and playable here.
On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
Spec-true · not judged yet. Accurate, and right for the current UK specification.
Focused · passed. One idea, short enough to watch in one go.
Accessible · not judged yet. Good captions, clear sound and pictures.
Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.

★ passed · ☆ pending · ✕ failed

Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.

How the Heddy Score works

Why we picked it

Crossover non-calculator revision built around the May 2023 Paper 1; suits Year 10–11 students on either tier aiming for grade 5.

The GCSE Maths Tutor on YouTubechecked 2026-10-16