Keystones — Lintel
Five GCSE retrieval questions · 8 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00099 in standard form
Answer: 9.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.48cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 950g
Answer: 100:19 -
5. Statistics Mean
Calculate the mean of: 36, 46, 34, 21, 30, 31, 7, 15
Answer: 27.5