Keystones — Lintel
Five GCSE retrieval questions · 26 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0041 in standard form
Answer: 4.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.12cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 1:3:3
Answer: 24, 72 and 72 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 40, 25, 40, 37, what is the missing number?
Answer: 23