Keystones — Lintel
Five GCSE retrieval questions · 3 December 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0007
Answer: 7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 32°. Find opposite
Answer: 11.2cm -
4. Ratio Mixed ratio problems
Divide 116 in the ratio 1:2:1
Answer: 29, 58 and 29 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 28, 17, 26, 44, 41, what is the missing number?
Answer: -30