Keystones — Lintel
Five GCSE retrieval questions · 18 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0055 in standard form
Answer: 5.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.94cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 2:1:2
Answer: 32, 16 and 32 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 28, 26, 45, what is the missing number?
Answer: 49