Keystones — Lintel
Five GCSE retrieval questions · 23 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 450,000,000 in standard form
Answer: 4.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 6
Answer: (x - 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 15.71cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:15
Answer: 4:2:5 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 45, 37, 32, 39, 15, what is the missing number?
Answer: 54