Keystones — Lintel
Five GCSE retrieval questions · 19 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 46,000,000 in standard form
Answer: 4.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 63
Answer: (x + 9)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.13cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 800g
Answer: 15:2 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 32, 38, 45, what is the missing number?
Answer: 5