Keystones — Lintel
Five GCSE retrieval questions · 26 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 19,000,000 in standard form
Answer: 1.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 10.07cm -
4. Ratio Mixed ratio problems
In ratio 11:11:5, what fraction is the third part?
Answer: 5⁄27 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 24, 39, 21, 45, what is the missing number?
Answer: 51