Keystones — Lintel
Five GCSE retrieval questions · 13 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0058 in standard form
Answer: 5.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 11.8cm -
4. Ratio Mixed ratio problems
Simplify: 18:15:12
Answer: 6:5:4 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 45, 22, 47, 44, what is the missing number?
Answer: 42