Keystones — Lintel
Five GCSE retrieval questions · 9 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00064 in standard form
Answer: 6.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 16
Answer: (x + 8)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 13.76cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 3:1:1
Answer: 54, 18 and 18 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 36, 15, 36, what is the missing number?
Answer: 37