Keystones — Lintel
Five GCSE retrieval questions · 19 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 54
Answer: (x - 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.86cm -
4. Ratio Mixed ratio problems
£105.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £42.00 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 27, 35, 18, what is the missing number?
Answer: 32