Keystones — Lintel
Five GCSE retrieval questions · 12 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000055 in standard form
Answer: 5.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 23.49cm -
4. Ratio Mixed ratio problems
Simplify: 6:15:18
Answer: 2:5:6 -
5. Statistics Mean
Calculate the mean of: 14, 46, 17, 18, 15, 6, 10, 42
Answer: 21