Keystones — Lintel
Five GCSE retrieval questions · 20 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 150,000 in standard form
Answer: 1.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 19.43cm -
4. Ratio Mixed ratio problems
Divide 66 in the ratio 1:2:3
Answer: 11, 22 and 33 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 33, 43, 35, what is the missing number?
Answer: 9