Keystones — Lintel
Five GCSE retrieval questions · 8 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 96,000 in standard form
Answer: 9.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 10
Answer: (x + 5)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 6.01cm -
4. Ratio Mixed ratio problems
Divide 135 in the ratio 2:3:4
Answer: 30, 45 and 60 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 30, 36, 48, 21, 49, what is the missing number?
Answer: 56