Keystones — Lintel
Five GCSE retrieval questions · 30 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00083 in standard form
Answer: 8.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 15.71cm -
4. Ratio Mixed ratio problems
Simplify: 6:4:6
Answer: 3:2:3 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 16, 50, 36, 23, what is the missing number?
Answer: 10