Keystones — Lintel
Five GCSE retrieval questions · 23 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000029 in standard form
Answer: 2.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.12cm -
4. Ratio Mixed ratio problems
Simplify: 8:16:8
Answer: 1:2:1 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 27, 35, 26, 15, what is the missing number?
Answer: 17