Keystones — Lintel
Five GCSE retrieval questions · 29 January 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
240000
Answer: 2.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 25°. Find adjacent side
Answer: 28.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 27, 39, 22, what is the missing number?
Answer: 72