Keystones — Lintel
Five GCSE retrieval questions · 1 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 500,000,000 in standard form
Answer: 5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 32.91cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 litre : 200 ml
Answer: 5:1 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 16, 40, 47, 27, what is the missing number?
Answer: 55