Keystones — Lintel
Five GCSE retrieval questions · 8 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 850,000,000 in standard form
Answer: 8.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 12.17cm -
4. Ratio Mixed ratio problems
Divide 180 in the ratio 2:4:3
Answer: 40, 80 and 60 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 29, 42, 43, 26, 16, what is the missing number?
Answer: 36