Keystones — Lintel
Five GCSE retrieval questions · 14 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 57,000 in standard form
Answer: 5.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 77
Answer: (x + 11)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.85cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 2:4:1
Answer: 32, 64 and 16 -
5. Statistics Mean
Calculate the mean of: 12, 32, 37, 47, 5, 9, 22. Give your answer to 2 decimal places
Answer: 23.43