Keystones — Lintel
Five GCSE retrieval questions · 1 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 140,000,000 in standard form
Answer: 1.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 34.58cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 650g
Answer: 40:13 -
5. Statistics Mean
Calculate the mean of: 33, 35, 25, 36, 19, 29
Answer: 29.5