Keystones — Lintel
Five GCSE retrieval questions · 24 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000049 in standard form
Answer: 4.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.47cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 8:11:6. What fraction of the sweets are purple?
Answer: 11⁄25 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 42, 26, 35, 22, 38, what is the missing number?
Answer: 65