Keystones — Lintel
Five GCSE retrieval questions · 21 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0098 in standard form
Answer: 9.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 12
Answer: (x + 4)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 20.34cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 2:1:2
Answer: 28, 14 and 28 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 49, 35, 29, 26, what is the missing number?
Answer: 36