Keystones — Lintel
Five GCSE retrieval questions · 11 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 690,000,000 in standard form
Answer: 6.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 60
Answer: (x + 10)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 16.79cm -
4. Ratio Mixed ratio problems
Simplify the ratio £6 : 55p
Answer: 120:11 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 37, 30, 29, 16, what is the missing number?
Answer: 33