Keystones — Lintel
Five GCSE retrieval questions · 1 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00048 in standard form
Answer: 4.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.87cm -
4. Ratio Mixed ratio problems
Simplify: 20:20:24
Answer: 5:5:6 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 39, 50, 26, what is the missing number?
Answer: 37