Keystones — Lintel
Five GCSE retrieval questions · 20 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.028 in standard form
Answer: 2.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.17cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 35 minutes
Answer: 48:7 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 20, 49, 17, what is the missing number?
Answer: 26