Keystones — Lintel
Five GCSE retrieval questions · 12 October 2026 · mathsvault.uk/keystones
-
1. Number Rounding to significant figures
Round 1839 to 2 significant figures
Answer: 1800 -
2. Algebra Linear nth term
Determine the nth term rule: 1, 5, 9, 13, 17, ...
Answer: 4n + -3 -
3. Geometry Area using ½ab sin C
Calculate area: sides 24cm and 10cm, included angle 30°
Answer: 60cm² -
4. Ratio Unitary method
If 10 items cost £39.40, how many items can you buy for £49.30?
Answer: 12.5 items -
5. Statistics Mode
Find the mode of: 12, 28, 65, 80, 45
Answer: No mode