Keystones — Lintel
Five GCSE retrieval questions · 15 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000023 in standard form
Answer: 2.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 17x + 66
Answer: (x + 11)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 14.28cm -
4. Ratio Mixed ratio problems
Divide 207 in the ratio 1:4:4
Answer: 23, 92 and 92 -
5. Statistics Mean
Calculate the mean of: 43, 33, 35, 39, 21, 41, 25. Give your answer to 2 decimal places
Answer: 33.86