Keystones — Lintel
Five GCSE retrieval questions · 5 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 28,000 in standard form
Answer: 2.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 10
Answer: (x - 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 3:10:9. What fraction of the sweets are purple?
Answer: 5⁄11 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 36, 28, 29, what is the missing number?
Answer: 59