Keystones — Lintel
Five GCSE retrieval questions · 6 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00044 in standard form
Answer: 4.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.33cm -
4. Ratio Mixed ratio problems
Express the first part of 2:9 as a fraction in simplest form
Answer: 2⁄11 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 17, 47, 34, 17, what is the missing number?
Answer: 60