Keystones — Lintel
Five GCSE retrieval questions · 4 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00027 in standard form
Answer: 2.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 22
Answer: (x + 11)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 19.59cm -
4. Ratio Mixed ratio problems
Simplify: 9:9:12
Answer: 3:3:4 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 28, 34, 50, what is the missing number?
Answer: 32