Keystones — Lintel
Five GCSE retrieval questions · 13 October 2018 · mathsvault.uk/keystones
-
1. Number Converting to standard form
100000
Answer: 1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 60°. Find opposite
Answer: 17.3cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 40, 42, 40, what is the missing number?
Answer: -30