Keystones — Lintel
Five GCSE retrieval questions · 2 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.022
Answer: 2.2 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 34°. Find opposite
Answer: 19.6cm -
4. Ratio Mixed ratio problems
Express the first part of 6:3 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 17, 49, 17, 40, what is the missing number?
Answer: -18