Keystones — Lintel
Five GCSE retrieval questions · 21 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.98cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 25cm
Answer: 8:1 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 26, 37, 44, 35, what is the missing number?
Answer: 13