Keystones — Lintel
Five GCSE retrieval questions · 23 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00002 in standard form
Answer: 2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 1:2:2
Answer: 30, 60 and 60 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 33, 45, 44, what is the missing number?
Answer: 18