Keystones — Lintel
Five GCSE retrieval questions · 30 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0037 in standard form
Answer: 3.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 17.6cm -
4. Ratio Mixed ratio problems
In ratio 7:12:12, what fraction is the third part?
Answer: 12⁄31 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 18, 23, 50, what is the missing number?
Answer: 49