Keystones — Lintel
Five GCSE retrieval questions · 24 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 20,000,000 in standard form
Answer: 2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 23.44cm -
4. Ratio Mixed ratio problems
Simplify: 16:12:16
Answer: 4:3:4 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 34, 29, 16, what is the missing number?
Answer: 37