Keystones — Lintel
Five GCSE retrieval questions · 29 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 470,000,000 in standard form
Answer: 4.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 14.58cm -
4. Ratio Mixed ratio problems
Divide 152 in the ratio 2:1:1
Answer: 76, 38 and 38 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 16, 32, 33, what is the missing number?
Answer: 43