Keystones — Lintel
Five GCSE retrieval questions · 18 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000095 in standard form
Answer: 9.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.07cm -
4. Ratio Mixed ratio problems
In ratio 2:2:6, what fraction is the third part?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 40, 31, 24, what is the missing number?
Answer: 25