Keystones — Lintel
Five GCSE retrieval questions · 8 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 21
Answer: (x + 7)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 45°. Find opposite
Answer: 19cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 600 ml
Answer: 20:3 -
5. Statistics Mean
Calculate the mean of: 16, 44, 19, 18, 23, 14. Give your answer to 2 decimal places
Answer: 22.33