Keystones — Lintel
Five GCSE retrieval questions · 9 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000098 in standard form
Answer: 9.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 16.41cm -
4. Ratio Mixed ratio problems
Divide 110 in the ratio 1:1:3
Answer: 22, 22 and 66 -
5. Statistics Mean
Calculate the mean of: 5, 28, 6, 40, 26, 22, 18. Give your answer to 2 decimal places
Answer: 20.71