Keystones — Lintel
Five GCSE retrieval questions · 10 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 970,000,000 in standard form
Answer: 9.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 7
Answer: (x - 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 9:12:7. What fraction of the sweets are orange?
Answer: 9⁄28 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 50, 28, 37, what is the missing number?
Answer: 13