Keystones — Lintel
Five GCSE retrieval questions · 1 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00026 in standard form
Answer: 2.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 15.94cm -
4. Ratio Mixed ratio problems
Divide 110 in the ratio 3:1:1
Answer: 66, 22 and 22 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 49, 27, 31, what is the missing number?
Answer: 29