Keystones — Lintel
Five GCSE retrieval questions · 8 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 990,000 in standard form
Answer: 9.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.86cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:9
Answer: 2:2:3 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 24, 48, 32, 33, what is the missing number?
Answer: 38