Keystones — Lintel
Five GCSE retrieval questions · 7 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 62,000 in standard form
Answer: 6.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 2:12:8. What fraction of the beads are yellow?
Answer: 4⁄11 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 23, 28, 17, what is the missing number?
Answer: 12