Keystones — Lintel
Five GCSE retrieval questions · 17 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 57,000,000 in standard form
Answer: 5.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.49cm -
4. Ratio Mixed ratio problems
Divide 60 in the ratio 2:2:1
Answer: 24, 24 and 12 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 17, 41, 17, what is the missing number?
Answer: 5