Keystones — Lintel
Five GCSE retrieval questions · 19 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00075 in standard form
Answer: 7.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.23cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:15
Answer: 4:4:5 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 18, 25, 46, 17, 24, what is the missing number?
Answer: 26