Keystones — Lintel
Five GCSE retrieval questions · 21 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 44,000,000 in standard form
Answer: 4.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.07cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 4:12. What fraction of the sweets are white?
Answer: 3⁄4 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 48, 17, 44, 24, 33, what is the missing number?
Answer: 26