Keystones — Lintel
Five GCSE retrieval questions · 14 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.099 in standard form
Answer: 9.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 13.8cm -
4. Ratio Mixed ratio problems
Simplify: 8:10:4
Answer: 4:5:2 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 36, 19, 28, what is the missing number?
Answer: 17