Keystones — Lintel
Five GCSE retrieval questions · 5 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.007 in standard form
Answer: 7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 32
Answer: (x + 8)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.45cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 12:6:2. What fraction of the counters are purple?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 20, 33, 17, 18, 25, what is the missing number?
Answer: 37