Keystones — Lintel
Five GCSE retrieval questions · 19 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.018 in standard form
Answer: 1.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 10.5cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 11:10. What fraction of the beads are white?
Answer: 10⁄21 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 33, 25, 34, 37, 33, what is the missing number?
Answer: 12