Keystones — Lintel
Five GCSE retrieval questions · 11 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00025 in standard form
Answer: 2.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 22.02cm -
4. Ratio Mixed ratio problems
£195.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £78.00 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 38, 45, 46, what is the missing number?
Answer: 19