Keystones — Lintel
Five GCSE retrieval questions · 16 April 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.053
Answer: 5.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 16
Answer: (x - 4)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 37°. Find opposite
Answer: 22.6cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 45, 29, 18, 27, what is the missing number?
Answer: -14