Keystones — Lintel
Five GCSE retrieval questions · 11 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000072 in standard form
Answer: 7.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 45
Answer: (x + 9)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 18.91cm -
4. Ratio Mixed ratio problems
Simplify: 9:6:18
Answer: 3:2:6 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 29, 22, 28, 50, what is the missing number?
Answer: 51