Keystones — Lintel
Five GCSE retrieval questions · 16 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000053 in standard form
Answer: 5.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.57cm -
4. Ratio Mixed ratio problems
In ratio 4:12:4, what fraction is the first part?
Answer: 1⁄5 -
5. Statistics Mean
Calculate the mean of: 17, 20, 26, 6, 17, 44, 21, 29
Answer: 22.5