Keystones — Lintel
Five GCSE retrieval questions · 30 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,200,000 in standard form
Answer: 1.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 10.91cm -
4. Ratio Mixed ratio problems
Simplify: 4:10:6
Answer: 2:5:3 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 40, 29, 26, 44, what is the missing number?
Answer: 51