Keystones — Lintel
Five GCSE retrieval questions · 29 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.054
Answer: 5.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 44°. Find opposite
Answer: 22.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 34, 30, 40, 24, 33, what is the missing number?
Answer: -35