Keystones — Lintel
Five GCSE retrieval questions · 22 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,600,000 in standard form
Answer: 6.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 72
Answer: (x - 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.54cm -
4. Ratio Mixed ratio problems
Divide 232 in the ratio 1:1:2
Answer: 58, 58 and 116 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 28, 30, 40, 30, what is the missing number?
Answer: 37