Keystones — Lintel
Five GCSE retrieval questions · 26 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.004 in standard form
Answer: 4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 20
Answer: (x + 10)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
Divide 161 in the ratio 2:3:2
Answer: 46, 69 and 46 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 46, 38, 21, what is the missing number?
Answer: 15