Keystones — Lintel
Five GCSE retrieval questions · 9 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 67,000,000 in standard form
Answer: 6.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 10
Answer: (x + 10)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.37cm -
4. Ratio Mixed ratio problems
Simplify: 8:4:6
Answer: 4:2:3 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 45, 48, 44, 40, what is the missing number?
Answer: 18