Keystones — Lintel
Five GCSE retrieval questions · 6 March 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0035
Answer: 3.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 34°. Find adjacent side
Answer: 24.9cm -
4. Ratio Mixed ratio problems
Express the first part of 4:5 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 26, 45, 36, what is the missing number?
Answer: -19