Keystones — Lintel
Five GCSE retrieval questions · 21 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00046
Answer: 4.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 52°. Find opposite
Answer: 21.8cm -
4. Ratio Mixed ratio problems
In ratio 1:1:3, what fraction is the second part?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 31, 41, 47, 21, what is the missing number?
Answer: 30