Keystones — Lintel
Five GCSE retrieval questions · 7 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0073 in standard form
Answer: 7.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 72
Answer: (x + 12)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 43.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 9m : 65cm
Answer: 180:13 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 38, 34, 22, 50, 21, what is the missing number?
Answer: 69