Keystones — Lintel
Five GCSE retrieval questions · 2 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 13,000 in standard form
Answer: 1.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.47cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 9:7. What fraction of the beads are purple?
Answer: 7⁄16 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 50, 27, 25, what is the missing number?
Answer: 30