Keystones — Lintel
Five GCSE retrieval questions · 15 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000065 in standard form
Answer: 6.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 30
Answer: (x + 10)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 6.87cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:12
Answer: 2:3:4 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 24, 30, 38, what is the missing number?
Answer: 48