Keystones — Lintel
Five GCSE retrieval questions · 1 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 410,000,000 in standard form
Answer: 4.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.5cm -
4. Ratio Mixed ratio problems
Divide 104 in the ratio 3:3:2
Answer: 39, 39 and 26 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 39, 31, 48, 32, 29, what is the missing number?
Answer: 25