Keystones — Lintel
Five GCSE retrieval questions · 17 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000036 in standard form
Answer: 3.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 12
Answer: (x + 12)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 20.34cm -
4. Ratio Mixed ratio problems
Simplify: 20:16:8
Answer: 5:4:2 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 38, 44, 17, 18, 27, what is the missing number?
Answer: 48