Keystones — Lintel
Five GCSE retrieval questions · 18 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.008 in standard form
Answer: 8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 14cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 300g
Answer: 40:3 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 36, 22, 30, 26, what is the missing number?
Answer: 66