Keystones — Lintel
Five GCSE retrieval questions · 6 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000068 in standard form
Answer: 6.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 13.33cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 450g
Answer: 20:9 -
5. Statistics Mean
Calculate the mean of: 48, 44, 13, 34, 42, 16, 11. Give your answer to 2 decimal places
Answer: 29.71