Keystones — Lintel
Five GCSE retrieval questions · 10 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0081 in standard form
Answer: 8.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 32.01cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 3:2:4
Answer: 42, 28 and 56 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 49, 45, 41, 43, 32, what is the missing number?
Answer: 12