Keystones — Lintel
Five GCSE retrieval questions · 10 October 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 - 10x + 16
Answer: (x - 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 6.61cm -
4. Ratio Mixed ratio problems
Divide 182 in the ratio 1:3:3
Answer: 26, 78 and 78 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 40, 21, 25, what is the missing number?
Answer: 34