Keystones — Lintel
Five GCSE retrieval questions · 24 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.033
Answer: 3.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 52°. Find adjacent side
Answer: 22.8cm -
4. Ratio Mixed ratio problems
Express the first part of 4:6 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 38, 15, 46, 26, 36, what is the missing number?
Answer: -29