Keystones — Lintel
Five GCSE retrieval questions · 2 June 2019 · 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 - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 50°. Find opposite
Answer: 32.2cm -
4. Ratio Mixed ratio problems
Simplify: 16:16:8
Answer: 2:2:1 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 32, 50, 15, what is the missing number?
Answer: 59