Keystones — Lintel
Five GCSE retrieval questions · 30 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 410,000 in standard form
Answer: 4.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 60
Answer: (x - 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 25 minutes
Answer: 12:5 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 38, 20, 15, 17, 30, what is the missing number?
Answer: 30