Keystones — Lintel
Five GCSE retrieval questions · 4 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,600,000 in standard form
Answer: 4.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
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: 10:6:4
Answer: 5:3:2 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 21, 39, 23, what is the missing number?
Answer: 61