Keystones — Lintel
Five GCSE retrieval questions · 3 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00007 in standard form
Answer: 7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 25
Answer: (x + 5)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.6cm -
4. Ratio Mixed ratio problems
£120.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £48.00 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 50, 23, 44, what is the missing number?
Answer: 35