Keystones — Lintel
Five GCSE retrieval questions · 9 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000037 in standard form
Answer: 3.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 22x + 121
Answer: (x - 11)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.9cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 20p
Answer: 5:1 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 17, 21, 43, what is the missing number?
Answer: 23