Keystones — Lintel
Five GCSE retrieval questions · 5 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0013 in standard form
Answer: 1.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.94cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 3:10:4. What fraction of the beads are orange?
Answer: 3⁄17 -
5. Statistics Mean
Calculate the mean of: 8, 16, 13, 14, 38, 33, 44, 48
Answer: 26.75