Keystones — Lintel
Five GCSE retrieval questions · 25 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 400,000 in standard form
Answer: 4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.8cm -
4. Ratio Mixed ratio problems
Simplify: 16:16:24
Answer: 2:2:3 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 24, 19, 18, what is the missing number?
Answer: 31