Keystones — Lintel
Five GCSE retrieval questions · 25 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 460,000,000 in standard form
Answer: 4.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 24.77cm -
4. Ratio Mixed ratio problems
Simplify: 4:4:12
Answer: 1:1:3 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 24, 16, 49, what is the missing number?
Answer: 15