Keystones — Lintel
Five GCSE retrieval questions · 17 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,400,000 in standard form
Answer: 4.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.34cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 700 ml
Answer: 40:7 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 15, 37, 35, 46, what is the missing number?
Answer: 57