Keystones — Lintel
Five GCSE retrieval questions · 9 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0006 in standard form
Answer: 6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.2cm -
4. Ratio Mixed ratio problems
Simplify: 8:12:20
Answer: 2:3:5 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 32, 28, 16, 36, what is the missing number?
Answer: 23