Keystones — Lintel
Five GCSE retrieval questions · 31 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 730,000,000 in standard form
Answer: 7.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 5:8. What fraction of the marbles are blue?
Answer: 8⁄13 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 50, 19, 50, 21, 44, what is the missing number?
Answer: 14