Keystones — Lintel
Five GCSE retrieval questions · 6 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0068 in standard form
Answer: 6.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 40
Answer: (x + 10)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 13.28cm -
4. Ratio Mixed ratio problems
Divide 145 in the ratio 2:2:1
Answer: 58, 58 and 29 -
5. Statistics Mean
Calculate the mean of: 8, 37, 27, 24, 25, 29
Answer: 25