Keystones — Lintel
Five GCSE retrieval questions · 3 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 19,000 in standard form
Answer: 1.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 10.8cm -
4. Ratio Mixed ratio problems
Simplify: 12:9:18
Answer: 4:3:6 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 24, 18, 41, what is the missing number?
Answer: 5