Keystones — Lintel
Five GCSE retrieval questions · 29 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00065 in standard form
Answer: 6.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 10.94cm -
4. Ratio Mixed ratio problems
Simplify: 15:9:12
Answer: 5:3:4 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 50, 39, 26, 15, what is the missing number?
Answer: 25