Keystones — Lintel
Five GCSE retrieval questions · 8 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,500,000 in standard form
Answer: 9.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 28.97cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 150g
Answer: 20:3 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 36, 31, 19, what is the missing number?
Answer: 30