Keystones — Lintel
Five GCSE retrieval questions · 22 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000012 in standard form
Answer: 1.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.82cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 250g
Answer: 4:1 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 22, 21, 33, 18, 40, what is the missing number?
Answer: 16