Keystones — Lintel
Five GCSE retrieval questions · 7 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000036 in standard form
Answer: 3.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 17.51cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 1:4:2
Answer: 10, 40 and 20 -
5. Statistics Mean
Calculate the mean of: 7, 32, 36, 47, 21, 32. Give your answer to 2 decimal places
Answer: 29.17