Keystones — Lintel
Five GCSE retrieval questions · 11 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.033 in standard form
Answer: 3.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 26.15cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 11:5:11. What fraction of the marbles are red?
Answer: 11⁄27 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 19, 40, 25, what is the missing number?
Answer: 16