Keystones — Lintel
Five GCSE retrieval questions · 19 October 2021 · mathsvault.uk/keystones
-
1. Number Converting to standard form
430000
Answer: 4.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 31°. Find adjacent side
Answer: 30cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 16, 43, 34, 47, 42, what is the missing number?
Answer: -8