Keystones — Lintel
Five GCSE retrieval questions · 27 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00032 in standard form
Answer: 3.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 17.92cm -
4. Ratio Mixed ratio problems
Divide 180 in the ratio 2:1:2
Answer: 72, 36 and 72 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 20, 49, 48, 18, what is the missing number?
Answer: 15