Keystones — Lintel
Five GCSE retrieval questions · 4 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 440,000,000 in standard form
Answer: 4.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 40
Answer: (x - 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.72cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 5 minutes
Answer: 60:1 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 30, 28, 20, 32, what is the missing number?
Answer: 25