Keystones — Lintel
Five GCSE retrieval questions · 26 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0059 in standard form
Answer: 5.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.6cm -
4. Ratio Mixed ratio problems
Divide 128 in the ratio 4:3:1
Answer: 64, 48 and 16 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 27, 29, 50, what is the missing number?
Answer: 18