Keystones — Lintel
Five GCSE retrieval questions · 13 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00021 in standard form
Answer: 2.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.38cm -
4. Ratio Mixed ratio problems
Divide 160 in the ratio 2:2:1
Answer: 64, 64 and 32 -
5. Statistics Mean
Calculate the mean of: 24, 15, 21, 17, 30, 17. Give your answer to 2 decimal places
Answer: 20.67