Keystones — Lintel
Five GCSE retrieval questions · 1 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000068 in standard form
Answer: 6.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.76cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 850 ml
Answer: 60:17 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 29, 19, 26, what is the missing number?
Answer: 30