Keystones — Lintel
Five GCSE retrieval questions · 19 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
74000000
Answer: 7.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 63°. Find adjacent side
Answer: 6.8cm -
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 30. If 4 of them are 48, 34, 41, 36, what is the missing number?
Answer: -9