Keystones — Lintel
Five GCSE retrieval questions · 5 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 310,000 in standard form
Answer: 3.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 10.62cm -
4. Ratio Mixed ratio problems
Divide 220 in the ratio 2:2:1
Answer: 88, 88 and 44 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 16, 18, 21, 42, what is the missing number?
Answer: 33