Keystones — Lintel
Five GCSE retrieval questions · 7 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.041 in standard form
Answer: 4.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 110
Answer: (x + 10)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.16cm -
4. Ratio Mixed ratio problems
Divide 250 in the ratio 3:4:3
Answer: 75, 100 and 75 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 34, 26, 21, 49, 44, what is the missing number?
Answer: 42