Keystones — Lintel
Five GCSE retrieval questions · 9 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 300,000 in standard form
Answer: 3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 12.99cm -
4. Ratio Mixed ratio problems
Simplify: 20:20:8
Answer: 5:5:2 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 41, 38, 33, 22, what is the missing number?
Answer: 66