Keystones — Lintel
Five GCSE retrieval questions · 13 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00043 in standard form
Answer: 4.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 35.42cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:24
Answer: 5:6:6 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 25, 47, 32, 41, 28, what is the missing number?
Answer: 49