Keystones — Lintel
Five GCSE retrieval questions · 27 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0014 in standard form
Answer: 1.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 18.58cm -
4. Ratio Mixed ratio problems
Simplify: 12:9:15
Answer: 4:3:5 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 43, 17, 47, what is the missing number?
Answer: 33