Keystones — Lintel
Five GCSE retrieval questions · 26 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 920,000,000 in standard form
Answer: 9.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 19.56cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 3:1:4
Answer: 45, 15 and 60 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 18, 19, 16, 32, what is the missing number?
Answer: 65