Keystones — Lintel
Five GCSE retrieval questions · 14 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00099 in standard form
Answer: 9.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x + 9
Answer: (x + 3)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.9cm -
4. Ratio Mixed ratio problems
£301.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £86.00 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 17, 45, 20, what is the missing number?
Answer: 38