Keystones — Lintel
Five GCSE retrieval questions · 22 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0066 in standard form
Answer: 6.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.91cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:9
Answer: 2:6:3 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 28, 44, 39, 20, 17, what is the missing number?
Answer: 56