Keystones — Lintel
Five GCSE retrieval questions · 1 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.083
Answer: 8.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 49°. Find opposite
Answer: 26.5cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 49, 38, 32, what is the missing number?
Answer: -7