Keystones — Lintel
Five GCSE retrieval questions · 4 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 48
Answer: (x + 12)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.74cm -
4. Ratio Mixed ratio problems
Divide 261 in the ratio 2:4:3
Answer: 58, 116 and 87 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 18, 34, 26, 19, 35, what is the missing number?
Answer: 42