Keystones — Lintel
Five GCSE retrieval questions · 2 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.024 in standard form
Answer: 2.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.16cm -
4. Ratio Mixed ratio problems
Simplify: 12:24:24
Answer: 1:2:2 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 35, 31, 38, what is the missing number?
Answer: 12