Keystones — Lintel
Five GCSE retrieval questions · 24 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 23,000 in standard form
Answer: 2.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 34.5cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 2:4:3
Answer: 28, 56 and 42 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 20, 26, 47, what is the missing number?
Answer: 35