Keystones — Lintel
Five GCSE retrieval questions · 17 January 2023 · mathsvault.uk/keystones
-
1. Number Converting to standard form
94000000
Answer: 9.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 45°. Find opposite
Answer: 25cm -
4. Ratio Mixed ratio problems
Simplify: 6:15:6
Answer: 2:5:2 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 18, 23, 42, 21, 35, what is the missing number?
Answer: -13