Keystones — Lintel
Five GCSE retrieval questions · 11 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000029 in standard form
Answer: 2.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 43.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio £3 : 80p
Answer: 15:4 -
5. Statistics Mean
Calculate the mean of: 31, 23, 36, 38, 47, 29, 16. Give your answer to 2 decimal places
Answer: 31.43