Keystones — Lintel
Five GCSE retrieval questions · 9 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00036 in standard form
Answer: 3.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 54
Answer: (x + 9)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 25.6cm -
4. Ratio Mixed ratio problems
Divide 220 in the ratio 3:4:4
Answer: 60, 80 and 80 -
5. Statistics Mean
Calculate the mean of: 39, 5, 44, 21, 17, 23, 24. Give your answer to 2 decimal places
Answer: 24.71