Keystones — Lintel
Five GCSE retrieval questions · 22 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.088
Answer: 8.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 49°. Find opposite
Answer: 26.5cm -
4. Ratio Mixed ratio problems
Express the first part of 4:6 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 37, 28, 18, what is the missing number?
Answer: 37