Keystones — Lintel
Five GCSE retrieval questions · 12 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 99,000 in standard form
Answer: 9.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 16.52cm -
4. Ratio Mixed ratio problems
Divide 130 in the ratio 1:1:3
Answer: 26, 26 and 78 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 39, 33, 17, 15, what is the missing number?
Answer: 51