Keystones — Lintel
Five GCSE retrieval questions · 8 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00077 in standard form
Answer: 7.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 11.3cm -
4. Ratio Mixed ratio problems
Simplify: 8:20:20
Answer: 2:5:5 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 45, 20, 17, what is the missing number?
Answer: 22