Keystones — Lintel
Five GCSE retrieval questions · 3 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,500,000 in standard form
Answer: 5.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 55
Answer: (x + 11)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.07cm -
4. Ratio Mixed ratio problems
Simplify: 12:10:8
Answer: 6:5:4 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 31, 25, 19, 31, 43, what is the missing number?
Answer: 31