Keystones — Lintel
Five GCSE retrieval questions · 13 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00014 in standard form
Answer: 1.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 6
Answer: (x - 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.86cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 95cm
Answer: 40:19 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 50, 30, 16, 31, what is the missing number?
Answer: 28