Keystones — Lintel
Five GCSE retrieval questions · 12 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 43,000,000 in standard form
Answer: 4.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 132
Answer: (x + 11)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.cm -
4. Ratio Mixed ratio problems
Simplify: 12:24:20
Answer: 3:6:5 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 24, 25, 43, 22, what is the missing number?
Answer: 61