Keystones — Lintel
Five GCSE retrieval questions · 13 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 280,000,000 in standard form
Answer: 2.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 56
Answer: (x + 8)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.21cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:24
Answer: 5:6:6 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 37, 33, 26, what is the missing number?
Answer: 52