Keystones — Lintel
Five GCSE retrieval questions · 28 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000054 in standard form
Answer: 5.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 80
Answer: (x + 10)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 19.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 5 minutes
Answer: 24:1 -
5. Statistics Mean
Calculate the mean of: 5, 28, 20, 33, 10, 47, 35, 25. Give your answer to 2 decimal places
Answer: 25.38