Keystones — Lintel
Five GCSE retrieval questions · 17 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0045 in standard form
Answer: 4.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.2cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 12:12:10. What fraction of the beads are green?
Answer: 5⁄17 -
5. Statistics Mean
Calculate the mean of: 32, 43, 25, 18, 41, 10. Give your answer to 2 decimal places
Answer: 28.17