Keystones — Lintel
Five GCSE retrieval questions · 19 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.028 in standard form
Answer: 2.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.78cm -
4. Ratio Mixed ratio problems
£234.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £130.00 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 38, 38, 33, 28, what is the missing number?
Answer: 63