Keystones — Lintel
Five GCSE retrieval questions · 23 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00085 in standard form
Answer: 8.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 26.88cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 50 minutes
Answer: 18:5 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 25, 36, 47, 26, 17, what is the missing number?
Answer: 65