Keystones — Lintel
Five GCSE retrieval questions · 22 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00009 in standard form
Answer: 9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 15.82cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:8
Answer: 1:3:2 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 17, 27, 32, 30, what is the missing number?
Answer: 34