Keystones — Lintel
Five GCSE retrieval questions · 28 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.026
Answer: 2.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 41°. Find opposite
Answer: 21.7cm -
4. Ratio Mixed ratio problems
Divide 140 in the ratio 3:1:3
Answer: 60, 20 and 60 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 17, 33, 18, 48, what is the missing number?
Answer: -16