Keystones — Lintel
Five GCSE retrieval questions · 19 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.04 in standard form
Answer: 4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 56
Answer: (x + 8)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.73cm -
4. Ratio Mixed ratio problems
Simplify: 15:6:18
Answer: 5:2:6 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 20, 32, 32, 43, what is the missing number?
Answer: 38