Keystones — Lintel
Five GCSE retrieval questions · 19 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 99,000 in standard form
Answer: 9.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.89cm -
4. Ratio Mixed ratio problems
Simplify: 10:6:10
Answer: 5:3:5 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 18, 32, 26, 21, 16, what is the missing number?
Answer: 25