Keystones — Lintel
Five GCSE retrieval questions · 20 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 550,000,000 in standard form
Answer: 5.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 21.cm -
4. Ratio Mixed ratio problems
Simplify: 4:8:12
Answer: 1:2:3 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 20, 25, 37, 21, what is the missing number?
Answer: 67