Keystones — Lintel
Five GCSE retrieval questions · 4 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000031 in standard form
Answer: 3.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 23.cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 4:3:1
Answer: 72, 54 and 18 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 43, 22, 22, what is the missing number?
Answer: 33