Keystones — Lintel
Five GCSE retrieval questions · 17 January 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0023
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 32°. Find opposite
Answer: 8.cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 6 numbers is 20. If 5 of them are 19, 34, 37, 41, 24, what is the missing number?
Answer: -35