Keystones — Lintel
Five GCSE retrieval questions · 29 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 450,000 in standard form
Answer: 4.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 7.14cm -
4. Ratio Mixed ratio problems
Simplify: 9:9:6
Answer: 3:3:2 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 36, 26, 20, 48, 15, what is the missing number?
Answer: 47