Keystones — Lintel
Five GCSE retrieval questions · 3 January 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00053
Answer: 5.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 32°. Find opposite
Answer: 13.7cm -
4. Ratio Mixed ratio problems
In ratio 1:4:2, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 50, 39, 42, what is the missing number?
Answer: -27