Keystones — Lintel
Five GCSE retrieval questions · 25 February 2015 · 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 - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.22cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m : 80cm
Answer: 25:4 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 39, 16, 17, 23, what is the missing number?
Answer: 55