Keystones — Lintel
Five GCSE retrieval questions · 4 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.012 in standard form
Answer: 1.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 15.39cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 14:4. What fraction of the beads are orange?
Answer: 7⁄9 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 33, 21, 45, 47, what is the missing number?
Answer: 44