Keystones — Lintel
Five GCSE retrieval questions · 19 March 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
33000000
Answer: 3.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 38°. Find opposite
Answer: 15.6cm -
4. Ratio Mixed ratio problems
Express the first part of 6:5 as a fraction in simplest form
Answer: 6⁄11 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 48, 39, 25, 44, 17, what is the missing number?
Answer: 25