Keystones — Lintel
Five GCSE retrieval questions · 10 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,700,000 in standard form
Answer: 5.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 6
Answer: (x + 2)(x - 3) -
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: 8:4:10
Answer: 4:2:5 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 20, 21, 39, what is the missing number?
Answer: 48