Keystones — Lintel
Five GCSE retrieval questions · 14 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0026 in standard form
Answer: 2.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 16.31cm -
4. Ratio Mixed ratio problems
Simplify: 24:16:20
Answer: 6:4:5 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 18, 48, 19, 17, what is the missing number?
Answer: 8