Keystones — Lintel
Five GCSE retrieval questions · 9 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 180,000 in standard form
Answer: 1.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 132
Answer: (x + 12)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 12.62cm -
4. Ratio Mixed ratio problems
Simplify: 20:12:20
Answer: 5:3:5 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 37, 38, 19, 49, what is the missing number?
Answer: 17