Keystones — Lintel
Five GCSE retrieval questions · 4 April 2021 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.00043
Answer: 4.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 30°. Find adjacent side
Answer: 23.4cm -
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 4 numbers is 22. If 3 of them are 31, 18, 36, what is the missing number?
Answer: 3