Keystones — Lintel
Five GCSE retrieval questions · 27 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000038 in standard form
Answer: 3.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.41cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 12:6:11. What fraction of the beads are yellow?
Answer: 11⁄29 -
5. Statistics Mean
Calculate the mean of: 40, 9, 11, 19, 33, 36. Give your answer to 2 decimal places
Answer: 24.67