Keystones — Lintel
Five GCSE retrieval questions · 26 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 42,000,000 in standard form
Answer: 4.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.37cm -
4. Ratio Mixed ratio problems
In ratio 4:8:1, what fraction is the third part?
Answer: 1⁄13 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 46, 30, 45, what is the missing number?
Answer: 35