Keystones — Lintel
Five GCSE retrieval questions · 12 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000018 in standard form
Answer: 1.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 19.56cm -
4. Ratio Mixed ratio problems
Simplify: 4:4:8
Answer: 1:1:2 -
5. Statistics Mean
Calculate the mean of: 17, 21, 6, 21, 37, 40. Give your answer to 2 decimal places
Answer: 23.67