Keystones — Lintel
Five GCSE retrieval questions · 27 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00019 in standard form
Answer: 1.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 36
Answer: (x + 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 13.27cm -
4. Ratio Mixed ratio problems
Simplify: 15:12:15
Answer: 5:4:5 -
5. Statistics Mean
Calculate the mean of: 17, 12, 19, 46, 5, 24
Answer: 20.5