Keystones — Lintel
Five GCSE retrieval questions · 11 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000064 in standard form
Answer: 6.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 14.06cm -
4. Ratio Mixed ratio problems
Divide 66 in the ratio 3:2:1
Answer: 33, 22 and 11 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 19, 22, 35, what is the missing number?
Answer: 64