Keystones — Lintel
Five GCSE retrieval questions · 2 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 7
Answer: (x - 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.28cm -
4. Ratio Mixed ratio problems
Express the second part of 9:14 as a fraction in simplest form
Answer: 14⁄23 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 32, 21, 27, what is the missing number?
Answer: 60