Keystones — Lintel
Five GCSE retrieval questions · 1 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00067 in standard form
Answer: 6.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 36
Answer: (x + 9)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 35.81cm -
4. Ratio Mixed ratio problems
Divide 55 in the ratio 1:3:1
Answer: 11, 33 and 11 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 42, 20, 22, what is the missing number?
Answer: 48