Keystones — Lintel
Five GCSE retrieval questions · 20 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0007 in standard form
Answer: 7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 16.58cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m : 95cm
Answer: 160:19 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 26, 30, 38, what is the missing number?
Answer: 46