Keystones — Lintel
Five GCSE retrieval questions · 7 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0038 in standard form
Answer: 3.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.32cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 5:7:5. What fraction of the beads are green?
Answer: 5⁄17 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 39, 50, 37, what is the missing number?
Answer: 26