Keystones — Lintel
Five GCSE retrieval questions · 16 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000093 in standard form
Answer: 9.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.93cm -
4. Ratio Mixed ratio problems
Express the first part of 7:10 as a fraction in simplest form
Answer: 7⁄17 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 34, 22, 30, what is the missing number?
Answer: 18