Keystones — Lintel
Five GCSE retrieval questions · 18 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.021
Answer: 2.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 9
Answer: (x - 3)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 38°. Find opposite
Answer: 10.9cm -
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 5 numbers is 34. If 4 of them are 27, 49, 33, 45, what is the missing number?
Answer: 16