Keystones — Lintel
Five GCSE retrieval questions · 8 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0069 in standard form
Answer: 6.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.17cm -
4. Ratio Mixed ratio problems
Divide 243 in the ratio 2:3:4
Answer: 54, 81 and 108 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 42, 31, 17, 36, 27, what is the missing number?
Answer: 51