Keystones — Lintel
Five GCSE retrieval questions · 25 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 61,000 in standard form
Answer: 6.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 7
Answer: (x - 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 22.67cm -
4. Ratio Mixed ratio problems
Divide 84 in the ratio 1:2:4
Answer: 12, 24 and 48 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 17, 46, 33, what is the missing number?
Answer: 52