Keystones — Lintel
Five GCSE retrieval questions · 19 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 230,000,000 in standard form
Answer: 2.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 60°. Find adjacent side
Answer: 9.5cm -
4. Ratio Mixed ratio problems
£161.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £69.00 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 20, 47, 16, what is the missing number?
Answer: 13