Keystones — Lintel
Five GCSE retrieval questions · 23 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,500,000 in standard form
Answer: 8.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 18.16cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 55 minutes
Answer: 48:11 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 28, 47, 31, what is the missing number?
Answer: 14