Keystones — Lintel
Five GCSE retrieval questions · 14 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000035 in standard form
Answer: 3.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 81
Answer: (x - 9)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.95cm -
4. Ratio Mixed ratio problems
Express the second part of 13:7 as a fraction in simplest form
Answer: 7⁄20 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 26, 17, 35, what is the missing number?
Answer: 54