Keystones — Lintel
Five GCSE retrieval questions · 18 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 520,000 in standard form
Answer: 5.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 12.96cm -
4. Ratio Mixed ratio problems
Divide 280 in the ratio 4:3:3
Answer: 112, 84 and 84 -
5. Statistics Mean
Calculate the mean of: 31, 23, 14, 25, 48, 21, 32. Give your answer to 2 decimal places
Answer: 27.71