Keystones — Lintel
Five GCSE retrieval questions · 12 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,100,000 in standard form
Answer: 9.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.15cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 5:5:6. What fraction of the sweets are purple?
Answer: 5⁄16 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 39, 32, 36, 22, what is the missing number?
Answer: 11