Keystones — Lintel
Five GCSE retrieval questions · 27 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0078 in standard form
Answer: 7.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.93cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 50 minutes
Answer: 6:5 -
5. Statistics Mean
Calculate the mean of: 44, 46, 50, 35, 13, 33, 19, 24
Answer: 33