16 lessons from established maths channels, all taught by native English speakers and all matched to a specific section of Unit 1. Every video ID was verified, so none of these links are broken.
American mathantics
Where degrees come from and why a full turn is 360. Start here if angles are new.
British corbettmaths
Angles that meet at a point: add what you know, subtract from 360°.
British corbettmaths
The 180° half-turn rule, with the reasons written out as Cambridge expects.
British corbettmaths
Shows *why* a quadrilateral totals 360° by splitting it into two triangles — this is the derivation objective 7Gg.11 asks for.
British stretchcorbettmaths
Full worked solutions to a mixed exercise. Try the questions first.
American mathantics
Naming angles and reading a diagram — the vocabulary needed before the rules.
British corbettmaths
Exactly the 5.2 skill: the pairs of equal angles made when two lines cross.
British corbettmaths
Corresponding, alternate and co-interior angles, with exam-style examples.
British stretchcorbettmaths
A second pass over the same ideas at a gentler pace.
American Math with Mr. J
The three ways two lines can be related, with the diagram marks explained.
British corbettmaths
How to place a protractor and — the part everyone gets wrong — which scale to read.
British corbettmaths
Drawing acute, obtuse and reflex angles accurately with a protractor.
American mathantics
Parallel and perpendicular explained from first principles, with the standard diagram marks.
American Math with Mr. J
Square, rectangle, rhombus, parallelogram, trapezium and kite, side by side.
American Math with Mr. J
Sorts the family by parallel sides, right angles and equal sides — the way Stage 7 classifies them.
American stretchMath with Mr. J
A longer walk through the whole family if you want the full picture.
| Section | Video | Channel | Accent | Level |
|---|---|---|---|---|
| 5.1 | Math Antics - Angles & Degrees | mathantics | American | core |
| 5.1 | Angles in a full circle | corbettmaths | British | core |
| 5.1 | Angles in a Straight Line | corbettmaths | British | core |
| 5.1 | Angles in Quadrilaterals | corbettmaths | British | core |
| 5.1 | Missing Angles — worked answers | corbettmaths | British | stretch |
| 5.2 | Math Antics - Angle Basics | mathantics | American | core |
| 5.2 | Vertically Opposite Angles | corbettmaths | British | core |
| 5.2 | Angles: Parallel Lines | corbettmaths | British | core |
| 5.2 | Angles in parallel lines | corbettmaths | British | stretch |
| 5.2 | Parallel, Intersecting, and Perpendicular Lines | Math with Mr. J | American | core |
| 5.3 | Measuring Angles | corbettmaths | British | core |
| 5.3 | Drawing angles | corbettmaths | British | core |
| 5.3 | Math Antics - Points, Lines, & Planes | mathantics | American | core |
| 5.3 | Types of Quadrilaterals | Math with Mr. J | American | core |
| 5.3 | Properties of Quadrilaterals | Math with Mr. J | American | core |
| 5.3 | Quadrilaterals Explained (mini course) | Math with Mr. J | American | stretch |