Keystones — Lintel
Five GCSE retrieval questions · 28 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,600,000 in standard form
Answer: 8.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.13cm -
4. Ratio Mixed ratio problems
Divide 184 in the ratio 2:1:1
Answer: 92, 46 and 46 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 15, 38, 16, 20, what is the missing number?
Answer: 16