Keystones — Lintel
Five GCSE retrieval questions · 1 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 780,000,000 in standard form
Answer: 7.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 44.66cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 900g
Answer: 20:9 -
5. Statistics Mean
Calculate the mean of: 31, 8, 48, 14, 32, 7. Give your answer to 2 decimal places
Answer: 23.33