Keystones — Lintel
Five GCSE retrieval questions · 5 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 740,000 in standard form
Answer: 7.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 21
Answer: (x + 7)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.17cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:9
Answer: 3:4:3 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 23, 30, 42, what is the missing number?
Answer: 57