Keystones — Lintel
Five GCSE retrieval questions · 17 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000067 in standard form
Answer: 6.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 litre : 900 ml
Answer: 10:9 -
5. Statistics Mean
Calculate the mean of: 36, 39, 14, 16, 29, 15, 26
Answer: 25