Keystones — Lintel
Five GCSE retrieval questions · 30 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0003 in standard form
Answer: 3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.55cm -
4. Ratio Mixed ratio problems
Express the second part of 2:8 as a fraction in simplest form
Answer: 4⁄5 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 37, 23, 27, 36, what is the missing number?
Answer: 37