Keystones — Lintel
Five GCSE retrieval questions · 29 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0064 in standard form
Answer: 6.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.93cm -
4. Ratio Mixed ratio problems
£185.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £111.00 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 32, 21, 27, what is the missing number?
Answer: 20