Keystones — Lintel
Five GCSE retrieval questions · 4 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.074 in standard form
Answer: 7.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.21cm -
4. Ratio Mixed ratio problems
In ratio 11:4:2, what fraction is the third part?
Answer: 2⁄17 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 43, 48, 37, what is the missing number?
Answer: 32