Keystones — Lintel
Five GCSE retrieval questions · 1 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 770,000,000 in standard form
Answer: 7.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 18
Answer: (x + 6)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 17.51cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:20
Answer: 3:5:5 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 41, 24, 32, 42, 20, what is the missing number?
Answer: 15