Keystones — Lintel
Five GCSE retrieval questions · 25 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 22,000,000 in standard form
Answer: 2.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 35.75cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 5 minutes
Answer: 48:1 -
5. Statistics Mean
Calculate the mean of: 48, 5, 27, 44, 45, 14, 44, 32. Give your answer to 2 decimal places
Answer: 32.38