Keystones — Lintel
Five GCSE retrieval questions · 8 July 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
200000
Answer: 2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 42°. Find opposite
Answer: 19.8cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 29, 50, 15, what is the missing number?
Answer: 54