Keystones — Lintel
Five GCSE retrieval questions · 25 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00021 in standard form
Answer: 2.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 14
Answer: (x + 7)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 11.87cm -
4. Ratio Mixed ratio problems
Divide 50 in the ratio 3:1:1
Answer: 30, 10 and 10 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 16, 35, 25, what is the missing number?
Answer: 24