Keystones — Lintel
Five GCSE retrieval questions · 8 September 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
69000000
Answer: 6.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 37°. Find adjacent side
Answer: 28cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 35, 47, 27, 33, 16, what is the missing number?
Answer: 10