Keystones — Lintel
Five GCSE retrieval questions · 4 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 69,000,000 in standard form
Answer: 6.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 15.82cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 850g
Answer: 100:17 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 30, 44, 46, 45, what is the missing number?
Answer: 20