Keystones — Lintel
Five GCSE retrieval questions · 10 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000034 in standard form
Answer: 3.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 26.92cm -
4. Ratio Mixed ratio problems
Divide 200 in the ratio 3:3:2
Answer: 75, 75 and 50 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 45, 17, 20, what is the missing number?
Answer: 38