Drills
Writing a number as a product of prime factors in index form, and reading its structure from the indices — three-digit numbers and beyond, past the KS3 drill.
Author note — to cover
- Fluency — divisibility tests and prime-or-not decisions on numbers like 91, 97 and 117 (4 questions).
- Factorising — single-choice questions picking the correct index-form factorisation of a three-digit number from near-miss options, and typed questions stating the index of a named prime in it; the engine cannot read a typed expression (4 questions).
- Structure — smallest multiplier to make a square or cube, and counting factors from the indices; both fail anyone who can only draw the tree (4 questions).
The test
—coming soon—
Where to go next
This mixed review uses the methods from these learning pages: