Keystones — Lintel
Five GCSE retrieval questions · 31 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.086 in standard form
Answer: 8.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 18.84cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 500g
Answer: 10:1 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 37, 50, 29, 36, what is the missing number?
Answer: 18