Keystones — Lintel
Five GCSE retrieval questions · 8 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0084 in standard form
Answer: 8.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 72
Answer: (x - 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.12cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 10 minutes
Answer: 6:1 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 25, 37, 19, 24, what is the missing number?
Answer: 60