Keystones — Lintel
Five GCSE retrieval questions · 17 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0024 in standard form
Answer: 2.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 5cm
Answer: 40:1 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 33, 21, 36, 18, what is the missing number?
Answer: 17