23 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
What negative numbers are and where they sit on the number line — the foundation for adding and subtracting integers.
American mathantics
Animated, step-by-step addition and subtraction of positive and negative integers on the number line.
British Corbettmaths
British-curriculum walkthrough of calculations such as −5 + 8 and 4 − (−3), including the double-negative rule.
American stretchKhan Academy
Builds the intuition for why subtracting a negative adds, rather than just giving the rule.
American mathantics
The sign rules for multiplying and dividing, and an explanation of why two negatives make a positive.
British Corbettmaths
Concise drill on multiplying positive and negative numbers, including squaring a negative.
British Corbettmaths
The companion video for division — completes the sign-rule pair for this section.
American Math with Mr. J
Builds from multiples to common multiples to the LCM — the best video to watch first.
American Math with Mr. J
Focused practice finding the LCM of a pair by listing multiples, the Stage 7 method.
British Corbettmaths
Uses the term “lowest common multiple”, which is the wording the Cambridge Stage 7 framework uses.
American Math with Mr. J
Starts from listing factors and works up to the greatest common factor (= HCF).
American Math with Mr. J
Longer guide with several worked examples if you need more practice.
British Corbettmaths
Uses the British “highest common factor” wording that matches the syllabus.
British stretchCorbettmaths
The prime-factorisation and Venn diagram method — a stretch technique beyond the listing method.
American Math with Mr. J
Clear rules and examples for the easiest divisibility tests.
American Math with Mr. J
The remaining tests, including the digit-sum rule for 9 and the combined rule for 6.
British stretchKevin Olding – Mathsaurus
A British presenter runs through every standard test and explains why each one works.
British Corbettmaths
What square numbers are and how the first few are generated.
British Corbettmaths
The square root as the inverse of squaring, with and without a calculator.
British Corbettmaths
Short explanation of cube numbers, pairing with the square numbers video.
British Corbettmaths
The meaning of cube root and how to cube-root a number.
American Math with Mr. J
Treats square roots and cube roots together as inverse operations — a good summary.
American stretchmathantics
Links index notation to roots and gives the wider context of powers.