Keystones — Lintel
Five GCSE retrieval questions · 16 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000058 in standard form
Answer: 5.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 90
Answer: (x - 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 29.26cm -
4. Ratio Mixed ratio problems
Simplify: 9:18:15
Answer: 3:6:5 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 30, 18, 16, 17, what is the missing number?
Answer: 49