Keystones — Lintel
Five GCSE retrieval questions · 26 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00057 in standard form
Answer: 5.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 13.28cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 45 minutes
Answer: 4:3 -
5. Statistics Mean
Calculate the mean of: 48, 16, 39, 36, 29, 15, 14, 6. Give your answer to 2 decimal places
Answer: 25.38