Keystones — Lintel
Five GCSE retrieval questions · 8 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00044 in standard form
Answer: 4.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.28cm -
4. Ratio Mixed ratio problems
In ratio 7:8:2, what fraction is the third part?
Answer: 2⁄17 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 40, 27, 48, 39, what is the missing number?
Answer: 21