Keystones — Lintel
Five GCSE retrieval questions · 7 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 830,000,000 in standard form
Answer: 8.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 88
Answer: (x + 11)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 26.92cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 2:13. What fraction of the beads are purple?
Answer: 13⁄15 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 45, 20, 18, 23, 26, what is the missing number?
Answer: 6