Keystones — Lintel
Five GCSE retrieval questions · 22 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.081 in standard form
Answer: 8.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 12.5cm -
4. Ratio Mixed ratio problems
Divide 154 in the ratio 3:1:3
Answer: 66, 22 and 66 -
5. Statistics Mean
Calculate the mean of: 27, 20, 37, 13, 5, 34, 44. Give your answer to 2 decimal places
Answer: 25.71