Keystones — Lintel
Five GCSE retrieval questions · 18 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,800,000 in standard form
Answer: 2.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 36
Answer: (x + 12)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.41cm -
4. Ratio Mixed ratio problems
Divide 161 in the ratio 2:3:2
Answer: 46, 69 and 46 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 45, 49, 17, what is the missing number?
Answer: 29