Keystones — Lintel
Five GCSE retrieval questions · 4 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 930,000,000 in standard form
Answer: 9.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 28.29cm -
4. Ratio Mixed ratio problems
In ratio 4:8:5, what fraction is the first part?
Answer: 4⁄17 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 16, 26, 43, what is the missing number?
Answer: 39