Keystones — Lintel
Five GCSE retrieval questions · 15 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0049
Answer: 4.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 47°. Find opposite
Answer: 23.6cm -
4. Ratio Mixed ratio problems
In ratio 2:1:2, what fraction is the second part?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 17, 44, 21, what is the missing number?
Answer: 6