Maths · GCSE · Number
Surds: exact roots
mh4Free5:21Heddy Score 2 of 7, below the standardPlays from youtube-nocookie.com. No YouTube cookies until you press play.
What you need to know
- A surd is a root that cannot be written as a whole number or fraction.
- √(ab) = √a × √b lets a surd be split using a square factor.
- Simplify by taking out the largest square factor.
In this clip
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.2/7, Below the standard
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · failed. A teacher watched it: it mainly teaches this map topic.
- Spec-true · failed. 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.
Our students
How the Heddy Score worksNot enough students yet
Our own students' answers. These are what move ★7 Proven.Why we picked it
Primrose Kitten's long A-Level Pure revision; only the surds section overlaps GCSE, so it is linked there for older or stretch students.
Primrose Kitten Academy | GCSE & A-Level Revision on YouTubechecked 2026-10-16