Keystones — Lintel
Five GCSE retrieval questions · 17 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,600,000 in standard form
Answer: 9.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 37.06cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 2:8. What fraction of the marbles are orange?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 31, 48, 24, what is the missing number?
Answer: 17