Keystones — Lintel
Five GCSE retrieval questions · 6 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
65000000
Answer: 6.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 40°. Find opposite
Answer: 21.8cm -
4. Ratio Mixed ratio problems
Simplify: 16:12:12
Answer: 4:3:3 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 25, 25, 39, 35, 46, what is the missing number?
Answer: -32