Keystones — Lintel
Five GCSE retrieval questions · 22 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 280,000,000 in standard form
Answer: 2.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 23.89cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 500 ml
Answer: 6:1 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 38, 32, 16, what is the missing number?
Answer: 70