Keystones — Lintel
Five GCSE retrieval questions · 8 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00088 in standard form
Answer: 8.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.62cm -
4. Ratio Mixed ratio problems
Simplify the ratio £5 : 60p
Answer: 25:3 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 24, 22, 35, 48, 48, what is the missing number?
Answer: 39