Keystones — Lintel
Five GCSE retrieval questions · 11 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000077 in standard form
Answer: 7.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.74cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 60p
Answer: 5:3 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 37, 36, 24, 16, 22, what is the missing number?
Answer: 57