Keystones — Lintel
Five GCSE retrieval questions · 25 August 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.041
Answer: 4.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 31°. Find opposite
Answer: 8.4cm -
4. Ratio Mixed ratio problems
Simplify: 8:10:12
Answer: 4:5:6 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 21, 17, 38, what is the missing number?
Answer: 12