Keystones — Lintel
Five GCSE retrieval questions · 14 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00024 in standard form
Answer: 2.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 13.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 5 minutes
Answer: 36:1 -
5. Statistics Mean
Calculate the mean of: 39, 41, 12, 17, 21, 42. Give your answer to 2 decimal places
Answer: 28.67