Keystones — Lintel
Five GCSE retrieval questions · 18 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 120,000 in standard form
Answer: 1.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 16.19cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 11:8:12. What fraction of the marbles are orange?
Answer: 11⁄31 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 45, 44, 15, what is the missing number?
Answer: 36