Keystones — Lintel
Five GCSE retrieval questions · 29 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0077 in standard form
Answer: 7.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.7cm -
4. Ratio Mixed ratio problems
Simplify: 8:4:6
Answer: 4:2:3 -
5. Statistics Mean
Calculate the mean of: 44, 49, 10, 25, 41, 47, 28, 21. Give your answer to 2 decimal places
Answer: 33.13