Keystones — Lintel
Five GCSE retrieval questions · 28 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,100,000 in standard form
Answer: 5.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.16cm -
4. Ratio Mixed ratio problems
Simplify: 16:24:8
Answer: 2:3:1 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 29, 17, 44, what is the missing number?
Answer: 30