Keystones — Lintel
Five GCSE retrieval questions · 3 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000049 in standard form
Answer: 4.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.32cm -
4. Ratio Mixed ratio problems
Express the first part of 9:13 as a fraction in simplest form
Answer: 9⁄22 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 29, 42, 15, what is the missing number?
Answer: 26