Keystones — Lintel
Five GCSE retrieval questions · 11 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0022 in standard form
Answer: 2.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 72
Answer: (x + 12)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 23.59cm -
4. Ratio Mixed ratio problems
Simplify: 8:8:6
Answer: 4:4:3 -
5. Statistics Mean
Calculate the mean of: 21, 12, 48, 17, 45, 24, 28. Give your answer to 2 decimal places
Answer: 27.86