Keystones — Lintel
Five GCSE retrieval questions · 26 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 400,000 in standard form
Answer: 4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.4cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 4:8. What fraction of the beads are red?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 32, 29, 29, what is the missing number?
Answer: 14