Keystones — Lintel
Five GCSE retrieval questions · 4 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 90,000,000 in standard form
Answer: 9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.25cm -
4. Ratio Mixed ratio problems
Simplify: 12:16:8
Answer: 3:4:2 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 48, 16, 25, what is the missing number?
Answer: 47