Keystones — Lintel
Five GCSE retrieval questions · 3 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00022 in standard form
Answer: 2.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 18.23cm -
4. Ratio Mixed ratio problems
Divide 145 in the ratio 1:1:3
Answer: 29, 29 and 87 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 40, 22, 33, 50, what is the missing number?
Answer: 20