Keystones — Lintel
Five GCSE retrieval questions · 4 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 13,000,000 in standard form
Answer: 1.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 48.5cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 1:2:1
Answer: 36, 72 and 36 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 40, 47, 26, what is the missing number?
Answer: 23