Keystones — Lintel
Five GCSE retrieval questions · 25 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.028
Answer: 2.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 55°. Find opposite
Answer: 31.4cm -
4. Ratio Mixed ratio problems
Express the first part of 3:4 as a fraction in simplest form
Answer: 3⁄7 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 21, 24, 38, 26, 33, what is the missing number?
Answer: -4