Keystones — Lintel
Five GCSE retrieval questions · 19 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0041
Answer: 4.1 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 31°. Find adjacent side
Answer: 19.7cm -
4. Ratio Mixed ratio problems
Express the first part of 2:3 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 42, 32, 48, 21, what is the missing number?
Answer: 2