Keystones — Lintel
Five GCSE retrieval questions · 9 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 84,000 in standard form
Answer: 8.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 14.3cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:8
Answer: 3:3:4 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 35, 15, 39, 24, what is the missing number?
Answer: 47