Keystones — Lintel
Five GCSE retrieval questions · 30 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0097 in standard form
Answer: 9.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 50 minutes
Answer: 24:5 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 19, 19, 47, 40, what is the missing number?
Answer: 65