Keystones — Lintel
Five GCSE retrieval questions · 15 October 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0047
Answer: 4.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 41°. Find opposite
Answer: 20.9cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 39, 21, 19, 28, what is the missing number?
Answer: 73