Keystones — Lintel
Five GCSE retrieval questions · 30 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00047 in standard form
Answer: 4.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.99cm -
4. Ratio Mixed ratio problems
Divide 161 in the ratio 1:4:2
Answer: 23, 92 and 46 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 47, 31, 28, 46, 19, what is the missing number?
Answer: 45