Keystones — Lintel
Five GCSE retrieval questions · 8 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0023 in standard form
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.08cm -
4. Ratio Mixed ratio problems
Divide 145 in the ratio 3:1:1
Answer: 87, 29 and 29 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 22, 47, 18, 20, 29, what is the missing number?
Answer: 14