Keystones — Lintel
Five GCSE retrieval questions · 5 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.031 in standard form
Answer: 3.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 3:1:4
Answer: 30, 10 and 40 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 19, 22, 35, 15, what is the missing number?
Answer: 49