Keystones — Lintel
Five GCSE retrieval questions · 21 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.053 in standard form
Answer: 5.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 84
Answer: (x - 7)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 19.3cm -
4. Ratio Mixed ratio problems
Simplify: 20:8:20
Answer: 5:2:5 -
5. Statistics Mean
Calculate the mean of: 42, 13, 5, 28, 37, 32, 39
Answer: 28