Keystones — Lintel
Five GCSE retrieval questions · 6 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 39,000 in standard form
Answer: 3.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 19.53cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 litre : 650 ml
Answer: 20:13 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 17, 19, 50, what is the missing number?
Answer: 62