Keystones — Lintel
Five GCSE retrieval questions · 4 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 73,000,000 in standard form
Answer: 7.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.81cm -
4. Ratio Mixed ratio problems
In ratio 7:5:8, what fraction is the third part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 18, 50, 30, what is the missing number?
Answer: 22