Keystones — Lintel
Five GCSE retrieval questions · 14 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 360,000 in standard form
Answer: 3.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x - 12
Answer: (x + 12)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 33.61cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 litres : 100 ml
Answer: 20:1 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 37, 33, 22, what is the missing number?
Answer: 8