Keystones — Lintel
Five GCSE retrieval questions · 25 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 470,000,000 in standard form
Answer: 4.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 72
Answer: (x + 12)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.74cm -
4. Ratio Mixed ratio problems
Simplify: 15:18:15
Answer: 5:6:5 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 15, 40, 35, what is the missing number?
Answer: 30