Keystones — Lintel
Five GCSE retrieval questions · 31 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 690,000,000 in standard form
Answer: 6.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.06cm -
4. Ratio Mixed ratio problems
In ratio 7:9:10, what fraction is the second part?
Answer: 9⁄26 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 20, 36, 21, what is the missing number?
Answer: 51