Keystones — Lintel
Five GCSE retrieval questions · 11 October 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.046
Answer: 4.6 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 42°. Find opposite
Answer: 12.6cm -
4. Ratio Mixed ratio problems
Simplify: 12:15:6
Answer: 4:5:2 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 25, 49, 29, 18, what is the missing number?
Answer: -6