Keystones — Lintel
Five GCSE retrieval questions · 20 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00034 in standard form
Answer: 3.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 10.91cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 1:2:1
Answer: 30, 60 and 30 -
5. Statistics Mean
Calculate the mean of: 20, 30, 23, 43, 48, 34, 37, 34. Give your answer to 2 decimal places
Answer: 33.63