Keystones — Lintel
Five GCSE retrieval questions · 7 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.039 in standard form
Answer: 3.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 38.11cm -
4. Ratio Mixed ratio problems
Divide 192 in the ratio 1:1:2
Answer: 48, 48 and 96 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 25, 28, 43, what is the missing number?
Answer: 56