Keystones — Lintel
Five GCSE retrieval questions · 17 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 72
Answer: (x + 12)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.44cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:12
Answer: 2:1:2 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 44, 15, 26, 35, 47, what is the missing number?
Answer: 49