Keystones — Lintel
Five GCSE retrieval questions · 29 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.078 in standard form
Answer: 7.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 33
Answer: (x + 11)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 40cm
Answer: 5:1 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 29, 50, 17, what is the missing number?
Answer: 32