Keystones — Lintel
Five GCSE retrieval questions · 11 February 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
980000
Answer: 9.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 56°. Find opposite
Answer: 31.cm -
4. Ratio Mixed ratio problems
Divide 104 in the ratio 2:3:3
Answer: 26, 39 and 39 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 47, 16, 35, 33, what is the missing number?
Answer: -11