Keystones — Lintel
Five GCSE retrieval questions · 17 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,700,000 in standard form
Answer: 4.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 8.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 500 ml
Answer: 6:1 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 16, 47, 29, 31, what is the missing number?
Answer: 52