Keystones — Lintel
Five GCSE retrieval questions · 23 June 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00041
Answer: 4.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 41°. Find opposite
Answer: 11.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 31, 37, 42, 46, what is the missing number?
Answer: -11