Keystones — Lintel
Five GCSE retrieval questions · 11 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 50,000,000 in standard form
Answer: 5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 72
Answer: (x + 12)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 4:6:5. What fraction of the beads are white?
Answer: 2⁄5 -
5. Statistics Mean
Calculate the mean of: 32, 15, 6, 29, 36, 46, 40. Give your answer to 2 decimal places
Answer: 29.14