Keystones — Lintel
Five GCSE retrieval questions · 26 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00082 in standard form
Answer: 8.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 23.48cm -
4. Ratio Mixed ratio problems
Express the second part of 13:12 as a fraction in simplest form
Answer: 12⁄25 -
5. Statistics Mean
Calculate the mean of: 41, 22, 17, 17, 19, 19, 18, 25
Answer: 22.25