Keystones — Lintel
Five GCSE retrieval questions · 4 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 660,000,000 in standard form
Answer: 6.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 46.2cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 7:10:7. What fraction of the beads are white?
Answer: 5⁄12 -
5. Statistics Mean
Calculate the mean of: 23, 20, 36, 43, 33, 32, 25. Give your answer to 2 decimal places
Answer: 30.29