Keystones — Lintel
Five GCSE retrieval questions · 29 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 29,000 in standard form
Answer: 2.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 34.56cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 950 ml
Answer: 100:19 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 20, 22, 31, what is the missing number?
Answer: 27