Keystones — Lintel
Five GCSE retrieval questions · 19 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000024 in standard form
Answer: 2.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.09cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m : 65cm
Answer: 100:13 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 49, 28, 35, 15, what is the missing number?
Answer: 8