Keystones — Lintel
Five GCSE retrieval questions · 2 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000063 in standard form
Answer: 6.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 22.64cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 2:3:2
Answer: 48, 72 and 48 -
5. Statistics Mean
Calculate the mean of: 10, 6, 20, 39, 6, 42, 42, 34. Give your answer to 2 decimal places
Answer: 24.88