Keystones — Lintel
Five GCSE retrieval questions · 15 October 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
2600000
Answer: 2.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 57°. Find opposite
Answer: 38.5cm -
4. Ratio Mixed ratio problems
Express the first part of 4:5 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 38, 15, 21, 18, 33, what is the missing number?
Answer: 19