Keystones — Lintel
Five GCSE retrieval questions · 6 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 60
Answer: (x - 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.97cm -
4. Ratio Mixed ratio problems
Simplify the ratio £2 : 15p
Answer: 40:3 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 43, 38, 24, 18, what is the missing number?
Answer: 47