Keystones — Lintel
Five GCSE retrieval questions · 9 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00002 in standard form
Answer: 2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.43cm -
4. Ratio Mixed ratio problems
Simplify: 8:8:20
Answer: 2:2:5 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 17, 47, 35, 20, 26, what is the missing number?
Answer: 29