Keystones — Lintel
Five GCSE retrieval questions · 31 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
19000000
Answer: 1.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 49°. Find adjacent side
Answer: 24.3cm -
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 5 numbers is 38. If 4 of them are 15, 30, 40, 26, what is the missing number?
Answer: 79