Keystones — Lintel
Five GCSE retrieval questions · 22 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000011 in standard form
Answer: 1.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 24.33cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:12
Answer: 3:5:4 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 24, 32, 42, what is the missing number?
Answer: 22