Keystones — Lintel
Five GCSE retrieval questions · 17 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 42,000 in standard form
Answer: 4.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.55cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 900 ml
Answer: 40:9 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 18, 35, 40, 32, 49, what is the missing number?
Answer: 36