Keystones — Lintel
Five GCSE retrieval questions · 19 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 36,000,000 in standard form
Answer: 3.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x + 6
Answer: (x + 3)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.43cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 4:1:3
Answer: 84, 21 and 63 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 38, 32, 15, 46, 43, what is the missing number?
Answer: 6