Keystones — Lintel
Five GCSE retrieval questions · 15 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.081 in standard form
Answer: 8.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 13.58cm -
4. Ratio Mixed ratio problems
Divide 160 in the ratio 3:3:4
Answer: 48, 48 and 64 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 39, 45, 18, 24, what is the missing number?
Answer: 14