Keystones — Lintel
Five GCSE retrieval questions · 29 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000099 in standard form
Answer: 9.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 34.95cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:8
Answer: 5:6:2 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 36, 28, 27, what is the missing number?
Answer: 41