Keystones — Lintel
Five GCSE retrieval questions · 21 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 490,000,000 in standard form
Answer: 4.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 30.99cm -
4. Ratio Mixed ratio problems
Divide 180 in the ratio 4:3:2
Answer: 80, 60 and 40 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 44, 16, 21, what is the missing number?
Answer: 19