Keystones — Lintel
Five GCSE retrieval questions · 14 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0095 in standard form
Answer: 9.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 45°. Find opposite
Answer: 29cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 15 minutes
Answer: 8:1 -
5. Statistics Mean
Calculate the mean of: 37, 45, 7, 28, 22, 24, 33
Answer: 28