Keystones — Lintel
Five GCSE retrieval questions · 16 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000043 in standard form
Answer: 4.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 48
Answer: (x + 8)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.cm -
4. Ratio Mixed ratio problems
Divide 85 in the ratio 3:1:1
Answer: 51, 17 and 17 -
5. Statistics Mean
Calculate the mean of: 16, 11, 17, 22, 44, 15, 41, 45. Give your answer to 2 decimal places
Answer: 26.38