Keystones — Lintel
Five GCSE retrieval questions · 21 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0039 in standard form
Answer: 3.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 120
Answer: (x + 10)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.02cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:8
Answer: 1:3:2 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 23, 24, 42, what is the missing number?
Answer: 35