Keystones — Lintel
Five GCSE retrieval questions · 15 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.024 in standard form
Answer: 2.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x + 5
Answer: (x + 5)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 12.5cm -
4. Ratio Mixed ratio problems
Divide 264 in the ratio 3:4:4
Answer: 72, 96 and 96 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 38, 18, 42, 20, what is the missing number?
Answer: 52