Keystones — Lintel
Five GCSE retrieval questions · 9 January 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0015
Answer: 1.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 40°. Find opposite
Answer: 14.3cm -
4. Ratio Mixed ratio problems
Simplify: 15:15:12
Answer: 5:5:4 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 41, 33, 16, 43, 36, what is the missing number?
Answer: 47