Keystones — Lintel
Five GCSE retrieval questions · 10 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 260,000 in standard form
Answer: 2.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 25.98cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 95cm
Answer: 40:19 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 40, 23, 20, what is the missing number?
Answer: 37