Keystones — Lintel
Five GCSE retrieval questions · 16 October 2011 · 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 + 9x + 18
Answer: (x + 6)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.78cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 55 minutes
Answer: 48:11 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 42, 16, 16, what is the missing number?
Answer: 18