Keystones — Lintel
Five GCSE retrieval questions · 24 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 780,000 in standard form
Answer: 7.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 2
Answer: (x + 1)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 16.8cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 6:11:11. What fraction of the beads are black?
Answer: 3⁄14 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 44, 20, 34, 20, what is the missing number?
Answer: 12