Keystones — Lintel
Five GCSE retrieval questions · 6 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 29,000,000 in standard form
Answer: 2.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.78cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 5 minutes
Answer: 36:1 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 25, 49, 29, 17, 27, what is the missing number?
Answer: 69