Keystones — Lintel
Five GCSE retrieval questions · 22 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000047 in standard form
Answer: 4.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 34.51cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:12
Answer: 3:1:3 -
5. Statistics Mean
Calculate the mean of: 28, 30, 26, 48, 47, 24, 28
Answer: 33