Keystones — Lintel
Five GCSE retrieval questions · 18 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,800,000 in standard form
Answer: 8.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.16cm -
4. Ratio Mixed ratio problems
Divide 184 in the ratio 1:3:4
Answer: 23, 69 and 92 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 30, 33, 40, 28, what is the missing number?
Answer: 9