Keystones — Lintel
Five GCSE retrieval questions · 20 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00022 in standard form
Answer: 2.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.91cm -
4. Ratio Mixed ratio problems
Simplify: 16:16:12
Answer: 4:4:3 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 17, 30, 29, 21, 43, what is the missing number?
Answer: 34