Keystones — Lintel
Five GCSE retrieval questions · 21 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.04 in standard form
Answer: 4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Divide 175 in the ratio 4:1:2
Answer: 100, 25 and 50 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 23, 21, 34, what is the missing number?
Answer: 42