Keystones — Lintel
Five GCSE retrieval questions · 27 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000025 in standard form
Answer: 2.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 81
Answer: (x + 9)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 27.98cm -
4. Ratio Mixed ratio problems
Simplify the ratio £5 : 5p
Answer: 100:1 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 40, 44, 28, what is the missing number?
Answer: 32