Keystones — Lintel
Five GCSE retrieval questions · 29 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 750,000,000 in standard form
Answer: 7.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 37.13cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 900g
Answer: 10:9 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 43, 46, 22, what is the missing number?
Answer: 45