Keystones — Lintel
Five GCSE retrieval questions · 24 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.031
Answer: 3.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 51°. Find opposite
Answer: 17.3cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:12
Answer: 3:1:3 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 16, 40, 46, what is the missing number?
Answer: 22