Keystones — Lintel
Five GCSE retrieval questions · 23 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,400,000 in standard form
Answer: 4.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x + 2
Answer: (x + 2)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 24.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 750g
Answer: 8:1 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 27, 26, 50, what is the missing number?
Answer: 41