Keystones — Lintel
Five GCSE retrieval questions · 18 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000047 in standard form
Answer: 4.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 48
Answer: (x + 8)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 11.92cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 70p
Answer: 10:7 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 34, 46, 19, what is the missing number?
Answer: 17