Keystones — Lintel
Five GCSE retrieval questions · 2 January 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
81000000
Answer: 8.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 40°. Find opposite
Answer: 9.2cm -
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 6 numbers is 37. If 5 of them are 17, 27, 32, 28, 37, what is the missing number?
Answer: 81