Keystones — Lintel
Five GCSE retrieval questions · 28 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000096 in standard form
Answer: 9.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 22.02cm -
4. Ratio Mixed ratio problems
Divide 114 in the ratio 1:2:3
Answer: 19, 38 and 57 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 29, 32, 40, 26, 32, what is the missing number?
Answer: 51