Keystones — Lintel
Five GCSE retrieval questions · 2 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0049 in standard form
Answer: 4.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 72
Answer: (x + 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 18.63cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 45 minutes
Answer: 8:3 -
5. Statistics Mean
Calculate the mean of: 34, 40, 31, 50, 47, 7, 40. Give your answer to 2 decimal places
Answer: 35.57