Keystones — Lintel
Five GCSE retrieval questions · 25 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00073 in standard form
Answer: 7.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 14.78cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 40 minutes
Answer: 3:2 -
5. Statistics Mean
Calculate the mean of: 21, 43, 9, 16, 44, 13, 15
Answer: 23