Keystones — Lintel
Five GCSE retrieval questions · 31 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000035 in standard form
Answer: 3.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 13.51cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 12:3:3. What fraction of the beads are white?
Answer: 1⁄6 -
5. Statistics Mean
Calculate the mean of: 39, 15, 7, 38, 21, 11, 19. Give your answer to 2 decimal places
Answer: 21.43