Keystones — Lintel
Five GCSE retrieval questions · 14 April 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0033
Answer: 3.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 37°. Find opposite
Answer: 7.5cm -
4. Ratio Mixed ratio problems
Express the first part of 6:4 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 33, 31, 22, what is the missing number?
Answer: 26